Stacy is trying to find a parking spot in a busy parking lot. she sees an open space and heads toward it, but before she can pull in, a car cuts her off, zooms into the space, and nearly causes an accident. during this time, stacey's heart begins racing, and a moment later she realizes she must be angry. which theory best explains her reaction?

The answer is that James-Lange theory best explains her reaction.
This theory was proposed in 1884 and it joined the thoughts of William James and Danish physiologist Carl Lange, who to a great extent autonomously arrived at a similar conclusion and this theory is one of the earliest theories of emotion within modern psychology. The James– Lange hypothesis alludes to a theory on the origin and nature of emotions.  

Because she is a liberal