When John Bought a Car from His Father's Old Classmate

When John bought a car from his father's old classmate, Joe, he was only seventeen years old. The price of the car was $5000. He paid $1000 down and was to pay the remaining $4000 over time. With these facts in mind, which of the following statements is true? (Read each statement separately.)

A) If John has an accident and refuses to pay the balance, Joe could successfully sue John for breach of contract.
B) If Joe didn't realize John was only 17 years old, he can enforce the contract against him no matter what his age.
C) If the car is defective, John could sue Joe for breach even though Joe could not sue him.
D) If John has an accident because of his negligent driving and he refuses to pay, Joe could successfully sue him in negligence to get around any difficulty in suing him in contract.
E) Even if the car is defective, John could not sue Joe.