1.S and B make an oral contract whereby S agrees to sell B, 480 widgets (goods) at a price of $480. Later, the parties want to modify the contract so that the price would become $520. This modification:

A.must be in writing.

B.must be oral because the first contract was oral.

C.can be oral but need not be.

D.is unenforceable because the first contract is unenforceable.