Two techniques that the Scrum Master could use when the Scrum Team gets caught in an internal disagreement about which agile practices to apply are to involve the complete Scrum Team in making a decision, and to use coaching techniques such as open questions and active listening, as stated in [3]: "The Scrum Master should facilitate a constructive dialogue among the team members and help them reach a consensus on which agile practices to use. The Scrum Master should also use coaching techniques such as open questions and active listening to understand the underlying needs and motivations of each team member and to help them find common ground."

According to the Scrum Guide1, the purpose of the Sprint Retrospective is to plan ways to increase quality and effectiveness. The Scrum Team inspects how the last Sprint went with regards to individuals, interactions, processes, tools, and their Definition of Done. Inspected elements often vary with domain, practices, and people involved. The Scrum Team identifies the most helpful changes to improve its effectiveness. The most impactful improvements are addressed as soon as possible. They may even be added to the Sprint Backlog for the next Sprint. Therefore, two appropriate topics for discussion during a Sprint Retrospective are:
Identifying high priority process improvements for the next Sprint.
How the team collaborates.
The other options are not relevant or appropriate for the Sprint Retrospective.

According to the Scrum Guide, the Development Team is responsible for creating a "Done" Increment that meets the Definition of "Done". User documentation is part of the Definition of "Done" in this scenario, so the Development Team must create it. The other options are not consistent with Scrum values and principles, such as self-organization, cross-functionality, and empiricism.

The Definition of Done serves the following three purposes:
A . Create a shared understanding of when work is complete.
The Definition of Done is a commitment to the quality of the product increment that is part of Scrum. It is a formal description of the state of the product backlog item or the increment when it meets the quality measures required for the product. The Scrum team must have a shared understanding of what 'done' means and use it to assess when work is complete and transparent1.
C . Increase transparency.
The Definition of Done increases transparency by providing everyone a shared understanding of what work was completed and what standards were met as part of the increment. This ensures that the product increment is potentially releasable and that the stakeholders can inspect and provide feedback on it2.
D . Describe the work that must be mostly done before the Sprint is allowed to end.
The Definition of Done describes the work that must be done before the Sprint is allowed to end. Work cannot be considered part of an increment unless it meets the Definition of Done. The Definition of Done is used to guide the Developers in creating a "Done", usable, and potentially releasable product increment every Sprint3.
B and E are not purposes of the Definition of Done.
B . Guide the Developers on how many Product Backlog items to select for the Sprint.
The Definition of Done does not guide the Developers on how many Product Backlog items to select for the Sprint. The Developers select how many Product Backlog items they can complete within a Sprint based on their capacity, skills, and experience. The Definition of Done helps them ensure that the selected items are completed to a high standard of quality4.
E . Describe the purpose, Objective, and timebox Of each Scrum event.
The Definition of Done does not describe the purpose, objective, and timebox of each Scrum event. The Scrum Guide describes these aspects for each Scrum event, such as Sprint Planning, Daily Scrum, Sprint Review, and Sprint Retrospective5. The Definition of Done is related to the product increment, not to the Scrum events.

The best answer is B. The Sprint length is unchanged and the Scrum Team continuously learns and adapts.
According to the Scrum Guide1, "Sprints have consistent durations throughout a development effort. A new Sprint starts immediately after the conclusion of the previous Sprint." Therefore, the Sprint is not extended or shortened based on the completion of the work.
The Scrum Guide also states that "Scrum Teams deliver products iteratively and incrementally, maximizing opportunities for feedback. Incremental deliveries of 'Done' product ensure a potentially useful version of working product is always available." Therefore, the Scrum Team should focus on delivering a potentially releasable Increment of value by the end of the Sprint, even if some work items are not completed.
The Scrum Team should also use the Sprint Retrospective to inspect how the last Sprint went with regards to individuals, interactions, processes, tools, and their Definition of Done. The Scrum Team should identify and order the major items that went well and potential improvements, and create a plan for implementing improvements to the way they do their work. This way, the Scrum Team continuously learns and adapts to changing circumstances and challenges.