An important aspect of Scrum are timeboxes.

C. Timeboxes encourage the people who are closest to the problem to create the best possible result in the time allotted, given the current context.

This is true because timeboxes limit the amount of time that can be spent on an activity, which forces the Scrum Team to focus on the most valuable and feasible outcomes. Timeboxes also empower the Scrum Team to make decisions based on their own expertise and experience, rather than relying on external authorities or instructions12. D. Timeboxes help everyone focus on the same problem at the same time.

This is true because timeboxes create a shared sense of urgency and alignment among the Scrum Team and the stakeholders. Timeboxes also enable frequent feedback and inspection, which help the Scrum Team adapt to changing requirements and expectations12.

References: 1: What Is Timeboxing in Scrum? - Visual Paradigm 2: What Is Timeboxing in Scrum and What Are the Benefits? Scrum Alliance