The Purpose of the Cross-Cultural Investigations That Tested Whether Human

The purpose of the cross-cultural investigations that tested whether human beings display similar facial expressions of emotion regardless of cultural/national differences was to demonstrate that:

A) facial behavior has an innate, unlearned component.
B) facial behavior has a learned, voluntary component.
C) some cultures express positive emotions clearly but negative emotions only vaguely.
D) some cultures are more emotionally expressive than are other cultures.