A Group of Researchers Discovered a Tribe of People in a South

Multiple Choice

A group of researchers discovered a tribe of people in a South American jungle.The tribe had never been exposed to the outside world before.The researchers initially greeted the tribe with a smile.They believe that emotional expressions have the same meaning for everyone.In this case,to which belief do these researchers subscribe?

A) the universality hypothesis
B) the two-factor theory
C) the hedonic principle
D) the drive-reduction theory