Though it was difficult, the project manager received agreement to the project charter from all four sponsors involved on the project and the U.S.$4,000,000 project was approved. Now the cost variance for the project is -$500 and the last performance review was positive. Just when the project entered its second phase ,a team member on a non-critical path activity announced she was leaving the company. The float of activity L changed from 2 to 4 days. Only one unidentified risk has occurred with a minor impact .The last quality review showed that the project has made use of the results of the last design of experiments. Based on this information, what should the project manager do NEXT?

A)Complete closure of the first phase.

B)Fast track the project to add more float.

C)Review the Project management plan.

D)Investigate additional risks caused by the difficulty with the senior managers.