Question

Ava looks down while sitting at the top of the ski lift. she immediately feels her heart start to pound. she is confused by this response until she remembers that she was also afraid the last time she was on a ski lift. ava realizes her heart is pounding because she is afraid. which theory of emotion best explains this sequence of events?

Answer 1

I believe the answer is: two-factor theory
The two factor theory  states that emotion is based on two factors: physiological arousal and cognitive label. 
On this scenario, the Physiological arousal would be the elevation that she felt when she took the lift, and the cogniitive label is the negative things she associated with the lift.