While walking home from dance class a year ago, Angela was assaulted. She sustained serious injuries from the assault and for four months afterwards had to undergo intensive treatment for them. Since the incident, she has been having intense nightmares and flashbacks where she reexperiences the assault. She also feels guilty, is very easily startled, feels the world is a dangerous place, and avoids taking her normal route home from dance class. When Angela went to see her psychologist, she was diagnosed as having