单选题 On a critical project, with a short timeframe, a contractor found an omission in a proposal which had been submitted and approved. The contractor indicated this omission may change both scope and thus cost to the project. Upon receiving notification, the PM should ______.

• A. submit, or ask the vender to submit, a change request to include the omission in the scope of the project
• B. check the type of the contract used and approve the increase to the budget
• C. since the project is falling behind, approve both the change in scope and the additional cost to the project to make sure the project is not delayed
• D. gather more information