Which sentence uses a verb that agrees with its subject?

a, many buses in the terminal are waiting to depart.

b, the aquarium radio with the fish printed on the sides are sarah's favorite.

Mr. amoroso is worried about jerri, a girl who is struggling in his seventh-grade class. he thinks about several different reasons why she might be having so much difficulty with her schoolwork. which one of the reasons he considers is consistent with a behaviorist perspective of learning?