The text clearly states that Miss Tracy praises James every five minutes unless he starts to fall asleep which means she is reinforcing the absence of the target behavior falling asleep during a specific interval This is the hallmark of a Differential Reinforcement of Other Behavior DRO procedure In a DRO reinforcement is delivered when a specific target behavior has not occurred during a predetermined interval The focus is on reinforcing any other behavior or the complete absence of the problem behavior within that time frame DRL Differential Reinforcement of Low Rates Option A reinforces a behavior when it occurs at a reduced but not zero rate The goal is to decrease the frequency of a behavior but not necessarily eliminate it entirely DRH Differential Reinforcement of High Rates Option B reinforces a behavior when it occurs at a high rate The goal is to increase the frequency of a desired behavior DRI Differential Reinforcement of Incompatible Behavior Option C reinforces a behavior that cannot physically occur simultaneously with the target behavior eg reinforcing sitting upright to reduce falling asleep While this is a type of DRA Differential Reinforcement of Alternative Behavior Miss Tracy is not specifically teaching or reinforcing an incompatible behavior but rather the absence of falling asleep allowing for any other behavior to occur The defining feature here is reinforcement for the nonoccurrence of the target behavior making DRO the most accurate classification