Which of the following promises is supported by legally sufficient consideration and will be enforceable?

Group of answer choices

A fathers promise to pay his son $50,000 because he has always been the fathers favorite son. A fathers promise to buy his 16 year-old son a new car in five years if he refrains from obtaining his drivers license until he is 21 years old. Ginnys promise to pay her neighbor $500 for all the times in the past that the neighbor has taken in Ginnys newspapers while Ginny was out of town. A contractors promise to continue with a simple kitchen remodeling if the homeowner pays an extra $10,000, because the contractor underestimated the amount of work required.