According to the James-Lange theory of emotions,

A) you feel an emotion, then you act.
B) you act, then you feel the emotion.
C) you act, then you appraise the situation
D) you feel an emotion, act, and appraise the situation simultaneously.

James-Lange Theory

The theory that emotions are the result of the perception of physiological responses to external events.

Emotion

An intricate mental condition characterized by someone's own perception, bodily responses, and manner of behavior or expression.

Appraise

To evaluate or estimate the nature, quality, ability, extent, or significance of something.