Answer:
The individuals that were told that the injection would cause them to become physiologically aroused.
Step-by-step explanation:
The experimenter's accomplice could have acted in one of two ways, either euphoric or irritated. The individuals who were informed that they would be aroused would be hesitant to display any emotion (out of fear or embarrassment) and therefore they would be the least likely people to experience the emotion portrayed by the experimenter's accomplice.