The Owner Insists That the Contractor Perform Certain Work That

The owner insists that the contractor perform certain work that the contractor claims is not part of the contract. Which of the following is an appropriate course of action for the contractor?

A) perform the disputed work hoping the owner will later agree to pay
B) stop work on the entire project unless the owner agrees to pay for the disputed work
C) perform all contractual obligations apart from the disputed work
D) none of the above