Wilma Has a Valid Driver's License but Has a Tendency

Wilma has a valid driver's license but has a tendency to get speeding tickets. Fred tells her that he will pay her $1,000 if she does not get a ticket for one year. Wilma drives very cautiously and goes through one year without a ticket. Is Fred obligated to pay?

A) yes, because Wilma gave up a legal right based on the agreement
B) no, because $1,000 is not an adequate amount based on Wilma's detriment
C) no, because Wilma suffered no detriment in this agreement
D) yes, because a promise is a promise and consideration has nothing to do with this agreement