Answer: A. Tony may rescind the contract on grounds of duress.
Step-by-step explanation:
For contracts to be considered enforceable, a key factor is that the parties involved must have entered into the agreement of their own accord and free will. Therefore Duress, which denies a person of that free will, becomes a reason why a contract can be voided.
Tony sold Peter the Mustang convertible because Peter had threatened to release details that Tony would rather were kept private so Tony capitulated and sold the Mustang. Had Peter not threatened him, Tony would not have sold the car. This shows that Tony only sold the car under duress and as such can void the contract.