Jim hired Gold Contracting to build a fancy gazebo in his backyard. The plans were complex and required expert workmanship. After the gazebo was completed, Jim was so pleased that he promised to pay Gold an additional $2,500 performance bonus. Later, when Gold demanded the bonus, Jim refused to pay it. If Gold sues Jim for the money, what is the most probable result?

A. Gold wins, because the bonus was used to entice Gold to do an outstanding job, which is adequate consideration.

B. Gold wins, because the bonus is for work they have already performed.

C. Jim wins, because the bonus is a reward for work they have already performed, which is past consideration and cannot be used to create a contract.

D. Jim wins, because the bonus agreement was not in writing.