What should the project manager do immediately about this situation?

A multiyear resource constraint project is midway through the execution phase. During a progress update meeting, it has been determined that there might be a schedule delay to deliver the project. The project manager has observed that all of the team members are working hard and lots of deliverables have already been completed.

What should the project manager do immediately about this situation?
A . Ask the project planner to identify the critical path and respective delayed activities, and then investigate the reasons for the delay.
B. Prepare a monthly report by highlighting the completed deliverables and communicate the delay to management.
C. Register the schedule risk and present the new resources requirement to the change management board for schedule recovery.
D. Ask the scheduler to update the schedule with the percent of work in progress (WIP) and communicate the results to the team.

Answer: D