The attorney you work for is trying to prove that a contract her client signed is invalid. Which of following conditions would have to be true for this to be the case?
A. There is a minor typo misspelling the client's address.
B. The client was a minor at the time the contract was signed.
C. The other party performed the contract but the client simply does not want to pay.
D. The client doesn't believe the contract is fair anymore.