Answer :
After Burt forced a smile on his face for thirty minutes, he actually started to feel the emotion of happiness. The theory is Schachter-Singer Theory.
What is Schachter-Singer Theory?
Schachter-Singer Theory is a theory of emotion.
It says that your emotions are triggered by your physical activity.
It is also known as two-factor theory.
Thus, the correct option is A. Schachter-Singer Theory.
Learn more about Schachter-Singer Theory
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