In a Classic Study of Emotional Display Rules, Japanese and American

In a classic study of emotional display rules, Japanese and American participants watched emotionally charged films either alone or in the presence of an experimenter (Ekman, 1972) . When in the presence of an experimenter, what happened?

A) Both American and Japanese participants exaggerated their responses to the film.
B) Neither the American nor the Japanese participants responded emotionally to the film.
C) The Americans were more likely to mask their emotional response.
D) The Japanese were more likely to mask their emotional response.