B: The Scrum Master coaches the Scrum Team and the organization how to work empirically. This is a true statement, as the Scrum Master is responsible for helping everyone understand and apply the principles and practices of Scrum, which is based on empirical process control. The Scrum Master can teach the Scrum Team and the organization how to use transparency, inspection, and adaptation to deliver valuable products in a complex environment.

C: The Scrum Master facilitates Scrum events as requested or needed. This is a true statement, as the Scrum Master is responsible for ensuring that all Scrum events take place and are positive, productive, and kept within the timebox. The Scrum Master can facilitate the communication and collaboration among the Scrum Team and the stakeholders during the Sprint Planning, Daily Scrum, Sprint Review, and Sprint Retrospective.

Scrum Guide 2020, page 6: ''The Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. They do this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.''

Scrum Guide 2020, page 13: ''The purpose of each event in Scrum is to create an opportunity for inspection and adaptation. These events are specifically designed to enable critical transparency and inspection.''

Professional Scrum Master II Course, page 13: ''The Scrum Master serves the Scrum Team by facilitating the Scrum events and ensuring that they are effective and valuable.''

The situation described in the question indicates that there are multiple problems in the Scrum Team that have led to the increase of technical debt and the dissatisfaction of the Product Owner. These problems include:

The Scrum Team has not used the past Sprint Retrospectives effectively to inspect and adapt. The Sprint Retrospective is an opportunity for the Scrum Team to reflect on their performance and identify improvements for the next Sprint. If the Scrum Team has not been using this event properly, they may have missed some issues or opportunities that could have improved their quality and value delivery.

The Developers have not been paying enough attention to quality. The Developers are accountable for creating a potentially releasable product increment that meets the Definition of Done and the Sprint Goal. If the Developers have not been focusing on quality, they may have introduced defects, errors, or inefficiencies that compromise the functionality and usability of the product.

The Scrum Team is not having conversations around technical debt. Technical debt is the accumulation of work that needs to be done to ensure that a product is maintainable and extensible in the future. If the Scrum Team is not discussing and managing technical debt, they may be neglecting some important aspects of the product architecture, design, or code that could affect its scalability, performance, or security.

The Scrum Master has not ensured that the Scrum Team is being transparent. The Scrum Master is responsible for establishing an environment where transparency, inspection, and adaptation can occur. If the Scrum Master has not ensured that the Scrum Team is being transparent, they may have allowed some hidden problems or assumptions to persist that could affect the quality and value of the product.

Scrum Guide 2020, page 13: ''The purpose of the Sprint Retrospective is to plan ways to increase quality and effectiveness.''

Scrum Guide 2020, page 10: ''The Developers are the people in the Scrum Team that are committed to creating any aspect of a usable Increment each Sprint.''

Professional Scrum Master II Course, page 12: ''Technical debt is a metaphor for expressing how doing things in a suboptimal way can accumulate over time and make it harder to change or improve a product in the future.''

Scrum Guide 2020, page 6: ''The Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. They do this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.''

The Definition of Done is a formal description of the state of the Increment when it meets the quality standards required for the product. The purpose of the Definition of Done is to:

During the Sprint, it helps the Developers identify the work remaining for an Increment to be ready for release by the end of a Sprint (B), by providing a clear and shared understanding of what ''Done'' means for each Product Backlog item and the Increment as a whole.

It creates transparency into the state of the Increment when it is inspected at the Sprint Review , by ensuring that everyone involved in the product development has the same expectations and criteria for evaluating the value, usability, and quality of the Increment.

It guides the Developers when creating a forecast at the Sprint Planning (D), by enabling them to estimate how much work they can realistically complete within a Sprint, based on their capacity, skills, and Definition of Done.

A: Arrange one-on-one coaching sessions where concerns the Scrum Master has identified can be discussed. This is a good way to provide individual feedback and guidance to the Scrum Team members and other people involved in the Scrum process. The Scrum Master can help them overcome any challenges or misunderstandings they may have about Scrum.

C: Schedule group training about Scrum. This is a good way to educate and inform a larger audience about the principles and practices of Scrum. The Scrum Master can use this opportunity to share their knowledge and experience with Scrum, and answer any questions or concerns that may arise.

E: Educate stakeholders and customers about Scrum. This is a good way to ensure that the people who have a stake in the product or service understand the benefits and expectations of Scrum. The Scrum Master can help them appreciate the value of empirical feedback, transparency, and collaboration that Scrum provides.

Scrum Guide 2020, page 6: ''The Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. They do this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.''

Professional Scrum Master II Course, page 8: ''The role of the Scrum Master is to help everyone involved in creating products with Scrum to understand, apply, and improve upon the use of the framework.''

C) Timeboxes encourage the people who are closest to the problem to create the best possible result in the time allotted, given the current context.

This is true because timeboxes limit the amount of time that can be spent on an activity, which forces the Scrum Team to focus on the most valuable and feasible outcomes.Timeboxes also empower the Scrum Team to make decisions based on their own expertise and experience, rather than relying on external authorities or instructions12. D. Timeboxes help everyone focus on the same problem at the same time.

This is true because timeboxes create a shared sense of urgency and alignment among the Scrum Team and the stakeholders.Timeboxes also enable frequent feedback and inspection, which help the Scrum Team adapt to changing requirements and expectations12.