Answer:
c. Babs saw Martin receive a candy bar for completing his reading list. She is careful to complete her reading list because she saw Martin get a reward for doing it.
Step-by-step explanation:
Indirect reinforcement occurs by observing other people's behaviors and their consequences. The results observed in the behavior of others can modify our behavior in the same way as the results obtained from direct experience. We can see an example of indirect reinforcement, where Babs saw Martin get a candy bar for completing his reading list. This has influenced Babs's behavior, making her want to complete her reading list because she saw Martin receive a reward for doing so.