Aruna Scored a C- on Her Chemistry Exam and So

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

A) the behavior feedback effect.
B) egocentrism.
C) the facial feedback effect.
D) spontaneous expression.