The correct answers are B and D. The Scrum Master is accountable for the Scrum Team’s effectiveness and helps the team improve its practices within the Scrum framework. One important way this happens is by facilitating Scrum Team decisions. That makes Option B correct. The Scrum Master does not make decisions for the team, but helps create the conditions for effective collaboration, self-management, and sound decision-making. This support improves the team’s ability to inspect, adapt, and work productively.

Option D is also correct because the Scrum Master serves the Scrum Team by causing the removal of impediments to the Scrum Team’s progress. Impediments reduce flow, create delays, and lower effectiveness. By helping remove those obstacles, the Scrum Master enables the team to focus on creating valuable Increments.

Option A is incorrect because ordering the Product Backlog is the Product Owner’s accountability, not the Scrum Master’s. Option C is too narrow. While the Scrum Master helps ensure Scrum events are positive, productive, and within the timebox, simply starting and ending meetings on time is not one of the two primary ways they help maximize team productivity. Their deeper contribution is enabling effectiveness and removing barriers.