When is a Sprint over?

The correct answer is D, because the Scrum Guide states that “a Sprint is a container for all other events. Each event in Scrum is a formal opportunity to inspect and adapt something. These events are specifically designed to enable critical transparency and inspection. Failure to include any of these events results in reduced transparency and is a lost opportunity to inspect and adapt.” Therefore, a Sprint is over when its time-box expires, regardless of whether all Product Backlog items or tasks are completed or not.