Golf Tournaments Are Promotion Tournaments Where the Person Coming in First

Golf tournaments are promotion tournaments where the person coming in first gets substantially more than the person coming in second. Which of the following would likely decrease the difference in prize money going to the person coming in first (assuming the tournament sponsors want each player to give their best effort to playing good golf) ?

A) Variation in playing conditions increase.
B) Players come to dislike the variation in pay more.
C) Players playing hard increases the money the tournament can make.
D) Golf rules are modified to allow players to hit each other with golf clubs.