The correct answer is A, because the Scrum Guide states that "a Sprint can be cancelled before the Sprint time-box is over. Only the Product Owner has the authority to cancel the Sprint, although he or she may do so under influence from the stakeholders, the Development Team, or the Scrum Master." Therefore, a Development Team cannot cancel a Sprint by itself.

The correct answer is B, because the Scrum Guide states that "at the end of a Sprint, the new Increment must be 'Done,' which means it must be in useable condition and meet the Scrum Team's definition of 'Done'. An increment is a body of inspectable, done work that supports empiricism at the end of the Sprint. The increment is a step toward a vision or goal." Therefore, all the increments from different Scrum Teams working on the same product should be integrated every Sprint to enable inspection and adaptation by the Product Owner and stakeholders.

The correct answer is B, because there is no role called "Project Manager" in Scrum. The Scrum Guide states that "Scrum recognizes no titles for Development Team members other than Developer, regardless of the work being performed by the person; there are no exceptions to this rule." Therefore, Scrum has only three roles: Product Owner, Scrum Master, and Developer.

According to the Scrum Guide 1 , an Increment is a concrete stepping stone toward the Product Goal. Each Increment is additive to all prior Increments and thoroughly verified, ensuring that all Increments work together. In order to provide value, an Increment must be usable. Multiple Increments may be created within a Sprint. The sum of the Increments is presented at the Sprint Review thus supporting empiricism. However, an Increment may be delivered to stakeholders prior to the end of the Sprint. The Sprint Review should never be considered a gate to releasing value. Therefore, in order to turn Product Backlog items into an Increment of potentially releasable product functionality, the Development Team should have all the skills needed.
References: Scrum Guide

The correct answers are B and C. According to the Scrum Guide, the Developers are accountable for creating a plan for the Sprint, which is the Sprint Backlog. That makes Option C correct. They are also accountable for organizing the work required to meet the Sprint Goal, which makes Option B correct. These are core elements of self-management in Scrum. Developers decide how to turn selected Product Backlog items into a valuable, usable Increment and how to adapt their plan throughout the Sprint.
Option A is incorrect because Scrum does not define "reporting productivity" as a Developer accountability.
Scrum focuses on outcomes, transparency, and progress toward the Sprint Goal rather than traditional productivity reporting. Option D is incorrect because selecting the Product Owner is not a Developer accountability. Role assignments are determined by the organization, not by the Developers.
These accountabilities matter because Scrum relies on Developers to manage their own work rather than wait for direction from others. By creating and adapting the Sprint Backlog and organizing work toward the Sprint Goal, the Developers enable collaboration, flexibility, and accountability for producing a Done Increment each Sprint.