Answer:
E. Exchange
Step-by-step explanation:
-Pressure: Is to force compliance by using intimidation.
-Ingratiation: Is becoming more likeable to ask for something.
-Coalition: Is to get people to help you to convince someone
-Personal appeal: Is to use friendship to ask for something
-Exchange: Is to offer or promise something to receive something else in return
According to this, the influence tactic that Gregory is using is Exchange because Gregory promised his agents a bonus if they meet the target.