Scientists Have Just Discovered a Tribe of People in a South

Scientists have just discovered a tribe of people in a South American jungle that have never been exposed to the outside world or people aside from those in their village. The first researchers greet them with a smile. Which emotion would the tribe member most likely attribute to the expression of a smile?

A) happiness
B) surprise
C) anger
D) There is no way to tell because emotional expressions are all culturally specific.