Sentence Correction

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 the 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
penalities if the deal was

B. is expected to make an offer for buying 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 the deal were


D. are expected to make an offer for buying First Interstate Bank until
it signs a merger agreement with a provision for penalities included if the deal was


E. are expected to be making an offer to buy First Interstate Bank until
they sign a merger agreement including a provision for penalites if the deal were

IMO A
sub is singular so all choices with are,they , them i.e B,C,D and E are having sub verb agreement

OA PLS

ok No one is singular so use of are is wrong so D and E are out
now deal is singular so was is to be used so left with A and B . i am not clear between to buy or for buying which one to be choosen? please anyone can clear it

On B, the "they" makes the sentence plural. So, it is wrong.

OA is A.
I missed the 'them' in option C.