Shawntae Scored a C- on Her Chemistry Exam and So

Shawntae scored a C- on her chemistry exam and so is feeling depressed.Her friend,Tabitha,suggests that she stop moping and join her for a walk around campus.Tabitha walks with a very straight back,moves her arms briskly,and has a smile on her face.Soon Shawntae mimics Tabitha and her mood becomes elevated.Shawntae's change in mood can be explained by

A) the behavior feedback effect.
B) egocentrism.
C) the facial feedback effect.
D) nonverbal sensitivity.