Ava looks down while sitting at the top of the Ferris wheel. She immediately feels her heart start to pound. She is confused by this response until she remembers her last experience on a Ferris wheel. During that experience, the wind started to blow, the seats began to rock, and she thought she was going to die. Ava realizes her heart is pounding because she is afraid. Which theory BEST explains this sequence of events?

the two-factor theory  

Explanation:

In psychology, the two-factor theory is associated with the emotion of an individual and it was introduced by Jerome E. Singer and Stanley Schachter. According to them, the emotion of an individual is based on the cognitive label and physiological arousal.

The two-factor theory describes that when an individual feels emotion then specific physiological arousal tend to occur and therefore he or she utilizes the instant environmental factors to look for various emotional cues in order to label the given "physiological arousal".

As per the question, the two-factor theory describes the sequence of the given events.