Varying the reinforcers used during teaching can help to:

Using a variety of reinforcers during teaching can significantly enhance a student's motivation. When the reinforcement strategies are diverse, they can maintain the student's interest and engagement in the learning process. This approach prevents the reinforcement from becoming monotonous or predictable, which can lead to reduced motivation. By introducing different forms of reinforcement—such as verbal praise, tangible rewards, or opportunities for preferred activities—teachers can cater to individual preferences and promote sustained involvement in tasks.

The other choices do not align as closely with the principle of varying reinforcers. Making the teaching session longer does not necessarily correlate with the effectiveness of varied reinforcers; in fact, longer sessions could lead to fatigue or disengagement. Ensuring that a student never loses interest is an ideal but not always feasible outcome, as interests can change regardless of reinforcer variety. Lastly, standardizing learning outcomes typically focuses on the consistency of the teaching and assessment methods, rather than the variability of reinforcement, which is more aimed at flexibility in motivational strategies. Thus, varying reinforcers is primarily beneficial for keeping the student motivated in their learning journey.