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 Guide, the Product Owner must participate in the Daily Scrum when he or she is actively working on items on the Sprint Backlog; however, they participate as a Developer, not as an authority figure. This means that the Product Owner can share progress, plans, and impediments with the other Developers and collaborate with them on delivering value. The other options are not valid reasons for the Product Owner to participate in the Daily Scrum, as they are either irrelevant (such as representing stakeholders or discussing impediments) or inappropriate (such as being asked by the Scrum Master).

The next Sprint begins immediately after the conclusion of the previous Sprint, as stated in the Scrum Guide:
"Sprints have consistent durations throughout a development effort. A new Sprint starts immediately after the conclusion of the previous Sprint."

According to the Scrum Guide, the Product Owner does not make sure that the Developers select enough from the Product Backlog for a Sprint to satisfy the stakeholders. The Developers are responsible for selecting how much work they can do in a Sprint, based on their capacity and past performance. The Product Owner may influence them by ordering and clarifying the Product Backlog items, but does not control their selection.

The correct answer is A, because the Scrum Guide states that "the definition of 'Done' is a formal description of the state of the Increment when it meets the quality measures required for the product." Therefore, non-functional requirements should be part of the definition of 'Done' and ensure every Increment meets them.