In Their Classic Experiment, Schachter and Singer Injected Students with Epinephrine

In their classic experiment, Schachter and Singer injected students with epinephrine, then told some of them about the side effects they might experience. Other subjects were not told about the drug's side effects because

A) not all people experience the effects of epinephrine, and the scientists did not want to bias the students.
B) uninformed subjects were more likely to try to suppress their emotional reactions.
C) the scientists wanted to find out whether confederates responded differently to informed and uninformed subjects.
D) the scientists wanted to compare uninformed subjects to informed subjects in the intensity of their emotional responses.