Zanna and Cooper Conducted an Experiment in Which Subjects Received

Zanna and Cooper conducted an experiment in which subjects received a pill and were told different effects of the pill. Some were told that the pill would arouse them and make them tense. Some were told it would do nothing. And some were told that it would relax them. They all wrote counter-attitudinal essays to create dissonance. Which group changed their attitude the most?

A) It was a tie between the relaxed and aroused groups.
B) It was the aroused group.
C) It was the group who were told the pill would do nothing.
D) It was the relaxed group.