Final answer:
Ace's best defense against Doral's assertion that Ace is legally bound by the option is option C. The promise of irrevocability was contained in a form supplied by Doral and was not separately signed by Ace.
Step-by-step explanation:
Ace's best defense against Doral's assertion that Ace is legally bound by the option is option C. The promise of irrevocability was contained in a form supplied by Doral and was not separately signed by Ace. In contract law, for an offer to be valid and enforceable, there must be a meeting of the minds between both parties. In this case, Ace did not separately sign the promise of irrevocability, indicating that they did not agree to be bound by the option and can therefore avoid their obligation.