Martin offers to pay Marietta "a million dollars" if she will take his final examfor him. Two other witnesses hear Martin make his offer. Marietta accepts the offer and takes the final exam for Martin. When she asks for payment, Martin refuses. If Marietta takes Martin to court, the judge will probably:

a. send Marietta to jail b. send Martin to jail

c. enforce the promise as a contract

d. not enforce the promise-it is not valid as a contract