A buyer agrees to all terms of a seller's offer except the length of time for a contingency to procure financing. The buyer extends the financing period in the offer by one week, signs the form, and mails it back to the seller. At this point, the seller's offer:
A) Is void.
B) Becomes an executory contract.
C) Becomes a counteroffer.
D) Has been accepted, since the modification was a contingency.
