A Enters into an Oral Contract Under Which a Is

A enters into an oral contract under which A is to sell his land to B,and B gives A a deposit of $100 000.00.B now changes his mind and wants his deposit back from A.In an action by B to recover the deposit

A) A can raise the validity of the agreement as a defence to B's action.
B) A cannot use the validity of the agreement as a defence to B's action.
C) A cannot use the validity of the agreement as a defence to B's action because the agreement is unenforceable.
D) B cannot sue A at all because the contract is unenforceable to B's action.
E) none of the above