Through research,scientists have made many conclusions about facial expressions and people's interpretation of them,including the fact that __________.

A) complex facial expressions are more difficult to interpret
B) facial expressions are contagious
C) it's almost impossible to spot a phony smile
D) a genuine smile is usually long-lasting

Facial Expressions

Visible changes in the face that convey emotional states, intentions, or reactions to stimuli, serving as crucial components of nonverbal communication.

Phony Smile

A forced or insincere smile, often used to hide one's true feelings or to socially conform.

Complex Expressions

Phrases or sentences that combine multiple elements such as operators, variables, and constants to convey a specific calculation or idea.