Alan tells Sherry that he will pay her $5,000 if she runs the Boston Marathon. Once Sherry starts running the marathon, Alan, legally, ________. Group of answer choices can revoke the contract as informal verbal agreements are not binding. can reduce the amount of money offered from $5,000 to $4,500, but only if Sherry doesn't place in the Boston Marathon. cannot revoke the contract. can sue for equitable damages only.