What should the project manager do next in this situation?

During the execution of a maintenance project the contractor submits an offer for additional work. The project manager realizes that the activities billed are included in the initial scope of work.

What should the project manager do next in this situation?
A . Review the project scope and negotiate with the contractor
B. Refuse the offer as it is included in the initial project scope
C. Review the project costs and communicate this to the project sponsor
D. Submit a change request to approve the offer

Answer: A