Erin Works on a Software Help Desk

Erin works on a software help desk. After being yelled at by a customer about the state of her company's software, she becomes angry, and has to take a short break to calm down. What makes her anger an emotion, rather than a mood?

A) It is a simple, unambiguous feeling.
B) It interferes with her capacity to work effectively.
C) It has a contextual stimulus.
D) It can be controlled given some time.
E) It cannot be controlled when it is elicited.