Recall That Participants in an Experiment by Miho Toi and Daniel

Recall that participants in an experiment by Miho Toi and Daniel Batson (1982) listened to an (alleged) radio interview in which a student in their Introductory Psychology class described an accident that caused her to fall behind in the course.Some participants were told that Carol would soon be returning to their class.Why would Toi and Batson refer to this as a "high cost" condition?

A) Carol was still in a wheelchair,and it would be hard for her to get to class.
B) Every time participants saw her,they would feel guilty if they didn't help her.
C) Participants would have to go out of their way to copy their notes for Carol.
D) Every time participants saw her,they would be able to empathize with her.