Answer:
Shaping
Step-by-step explanation:
It seems that in this scenario when the teacher gives candy to Trevor for specific actions/behaviors the teacher is using the method of Shaping. This is a behavior modification technique in which the individual (researcher) rewards the child (patient) when they exhibit a behavior close to the desired behavior in order to reinforce it. This continues and the rewards are only given out when the child exhibits an even closer behavior to the desired behavior until he/she finally reaches the desired behavior. Which is exactly what the teacher is doing in this situation.
Shaping can also be defined as the procedure that involves reinforcing behaviors that are closer to the target behavior,