Not one of the potential investors is expected to make an offer to buy First Interstate Bank until a merger agreement is signed that includes a provision for penalties if he deal were not to be concluded.
(A)is expected to make an offer to buy First Interstate Bank until a merger agreement is signed that includes a provision for penalties if he deal were
(B)is expected to make an offer to buy First Interstate Bank until they sign a merger agreement including a provision for penalties if the deal was
(C)is expected to make an offer to buy First Interstate Bank until a merger agreement be signed by them with a provision for penalties if he deal were
(D)are expected to make an offer for buying First Interstate Bank until it signs a merger agreement with a provision for penalties included if the deal was
(E)are expected to be making an offer for buying First Interstate Bank until they sign a merger agreement including a provision for penalties if the deal were
Answer: A
I picked E but realized that "are" cannot go with "one" because are is plural and "Not one" is singular. I don't understand why the correct answer is "deal were" and not "deal was." Could someone please explain?
Thanks in Advance!