Answer:
Reward power
Explanation:
Reward power is simply the power a team leader, supervisor or manager has to hand out rewards to their subordinates. A "good" should be able to reward employees based on their merits, e.g. the best salesman get a free dinner at an expensive restaurant, or paid vacations, etc.
In this case Kevin uses rewards to motivate his sales team. Whoever does the best job gets a sales lead (they probably earn sales commissions) and has the possibility of earning more money.