A Purchase Agreement for the Purchase of Real Property Is

A purchase agreement for the purchase of real property is

A) not necessary in a cash sale when the amount of earnest money paid equals the purchase price.
B) a legally enforceable contract which is binding on the seller as soon as it is signed by the buyer if the price and terms of the listing agreement are met exactly.
C) legally enforceable and binding on the buyer as soon as it is signed by him.
D) enforceable when the seller signs it and the buyer is notified of the seller's acceptance.