The correct answers are C and E, because these statements explain what "Done" means. No work left from the definition of "Done" means that all Product Backlog items selected for a Sprint meet the quality criteria agreed upon by the Scrum Team. All work to create software that is ready to be released to end users means that the Increment is potentially releasable at any time during the Sprint.

The correct answer is E, because all of these topics can be discussed during a Sprint Retrospective. The Scrum Guide states that "the purpose of the Sprint Retrospective is to plan ways to increase quality and effectiveness. ... During each Sprint Retrospective, the Scrum Team plans ways to improve product quality by adapting the definition of 'Done' as appropriate." Therefore, the Scrum Team can discuss any aspect of their process, communication, skills, or definition of 'Done' that may help them improve.

Detailed Explanation & Reference from Scrum
Scrum Guide Reference:
"The Sprint Backlog is composed of the Sprint Goal (why), the set of Product Backlog items selected for the Sprint (what), as well as an actionable plan for delivering the Increment (how)."
"The Sprint Backlog is a plan by and for the Developers. It is a highly visible, real-time picture of the work that the Developers plan to accomplish during the Sprint in order to achieve the Sprint Goal."
Why is "C. The Developers" Correct?
The Sprint Backlog is owned and managed by the Developers because they are the ones responsible for planning and executing the work.
The Developers update and modify the Sprint Backlog as needed during the Sprint.
The Scrum Team collaborates during Sprint Planning to define the Sprint Backlog, but the ongoing responsibility for managing it lies only with the Developers.
This allows the team to self-manage and adapt as work progresses.
❌ Incorrect Answers with Explanations
❌ A. The Scrum Team
Why is this Incorrect?
While the Scrum Team (Scrum Master, Product Owner, and Developers) collaborates during Sprint Planning, only the Developers are responsible for the Sprint Backlog.
The Scrum Master does not manage the Sprint Backlog, and the Product Owner does not modify it once the Sprint starts.
❌ B. The Scrum Master
Why is this Incorrect?
The Scrum Master facilitates the process but does not own or manage the Sprint Backlog.
The Scrum Master helps the team understand Scrum practices and remove impediments, but they do not decide or change the Sprint Backlog.
❌ D. The Product Owner
Why is this Incorrect?
The Product Owner is responsible for the Product Backlog, NOT the Sprint Backlog.
Once a Sprint starts, the Product Owner cannot modify the Sprint Backlog-only the Developers can update it as they learn more.

According to the Scrum Guide1, the definition of "Done" is a formal description of the state of the Increment when it meets the quality measures required for the product. The definition guides the Development Team in creating a "Done" Increment. The definition of "Done" is created by the development organization (or Development Team if none is available from the development organization). The definition of "Done" may vary significantly per Scrum Team, depending on the context. One aspect of Scrum Teams inspecting how they work toward their Product Goal is that they improve their definition of "Done" over time. Therefore, if a Product Backlog item worked on during the Sprint does not meet the definition of "Done", two things that should happen with the undone Product Backlog item are:
Put it on the Product Backlog for the Product Owner to decide what to do with it, as they are accountable for effective Product Backlog management and ordering.
Do not include the item in the Increment this Sprint, as it does not meet the quality standards and may compromise value.
The other options are not appropriate, as they may compromise transparency, inspection, or adaptation.

The correct answer is B, because the time-box for the Sprint Planning meeting is 8 hours for a monthly Sprint. The Scrum Guide states that "Sprint Planning is time-boxed to a maximum of eight hours for a one-month Sprint. For shorter Sprints, the event is usually shorter."