Answer:
Differential Reinforcement of Lower Rates.
Step-by-step explanation:
The reinforcement that is being used by James's teacher is the Differential Reinforcement of Lower Rates (DRL). This reinforcement is used to decrease the occurrence of acceptable behavior when it is done at low rates. It is not used to eliminate the behavior completely but to lower the rate of the behavior. The reinforcement will be delivered by his teacher if the behavior of greeting his peers occurs less than five times.