A Product Backlog item is considered complete when it meets the Definition of Done, as stated in [5]: "When a Product Backlog item or an Increment is described as "Done", everyone must understand what "Done" means. Although this varies significantly per Scrum Team, members must have a shared understanding of what it means for work to be complete, to ensure transparency. This is the definition of "Done" for the Scrum Team and is used to assess when work is complete on the product Increment."

Three topics for the Developers to discuss at the Daily Scrum as they inspect their progress toward the Sprint Goal are:
What have we learned since yesterday, and how should we modify our plan to increase our ability to meet the Sprint Goal?
Are there any impediments blocking progress toward the Sprint Goal?
Are there any decisions that need to be made to maintain progress toward the Sprint Goal?
These topics are suggested by [6]: "The structure of the meeting is set by the Developers and can be conducted in different ways if it focuses on progress toward the Sprint Goal. Some Development Teams will use questions, some will be more discussion based."

The correct answer is A, because the best way the Scrum Master can ensure that the Development Team communicates effectively with the Product Owner is to monitor communications between them and facilitate direct collaboration. The Scrum Guide states that "the Scrum Master serves the Product Owner in several ways, including ... facilitating Scrum events as requested or needed." Therefore, the Scrum Master should help the Development Team and the Product Owner interact regularly and productively during the Sprint Planning, Daily Scrum, Sprint Review, and Sprint Retrospective events.

The Developers determine how many Product Backlog items they select for a Sprint, as stated in the Scrum Guide: "The Developers select items from the Product Backlog to include in the current Sprint. The Scrum Team may refine these items during this process, which increases understanding and confidence."

According to the Scrum Guide, the Sprint Backlog is the Developers' plan for the Sprint, as it contains all the Product Backlog items selected for the Sprint and a plan for delivering them. The other options are not valid descriptions of the Sprint Backlog, as they are either incorrect (such as having a designated owner, being ordered by the Product Owner, or being a complete list of all work) or unnecessary (such as estimating each task in hours).