Answer:
The answer is the Schachter-Singer theory.
Explanation:
This theory explains that a physiological response is identified and labeled by the person, who then experiences an emotion. For example, increased blood pressure and sweating may be either caused by excitement or fear, so the person must identify how he feels based on the context.
In the example, Levi attributes his increased heart rate to caffeine (instead of stress or nervousness), so he stays calm.
