Jackie agrees to pay Ben $1,000 if Ben agrees to not go skydiving for six months. After Ben avoids skydiving for six months, he asks Jackie for payment. Jackie declines to pay Ben the $1,000. The contract between Jackie and Ben:
a. will be enforced because Ben exercised forbearance, which is legally sufficient consideration.
b. will not be enforced because skydiving is a dangerous activity and Ben benefits from the forbearance.
c. will be enforced because Jackie had a preexisting duty to pay Ben.
d. will not be enforced due to lack of consideration.