You've been assigned to take over managing a project that should be half complete according to the schedule. After an extensive evaluation, you discover the project is running far behind schedule, and will probably take twice the time originally estimated by the previous project manager. However, the sponsor has been told the project is on schedule. What is the best course of action?

A$.$ Try to restructure the schedule to meet the project deadline.

B$.$ Report your assessment to the sponsor.

C$.$ Turn the project back to the previous project manager.

D$.$ Move forward with the schedule as planned by the previous project manager, and report at the first missed milestone.