Analysis of Facial Muscles During Emotional Displays Has Revealed That

Analysis of facial muscles during emotional displays has revealed that:

A) most individuals are able to mimic grief accurately, getting the facial muscles just right.
B) false smiles tend to last ten seconds or more, but authentic smiles last only about two seconds.
C) false expressions use the same groups of muscles that are used in authentic expressions.
D) physiological responses ensure that facial expressions convey the emotion being felt.