One Difference Between Posttraumatic Stress Disorder (PTSD)and Phobias Is That

One difference between posttraumatic stress disorder (PTSD) and phobias is that:

A) with PTSD,the fear is triggered by a specific stimulus,whereas with phobias the fear is triggered by a wide variety of stimuli.
B) with phobias,the fear is triggered by a specific stimulus,whereas with PTSD the fear is triggered by a wide variety of stimuli.
C) PTSD,but not phobias,can be explained by classical conditioning.
D) Phobias,but not PTSD,can be explained by classical conditioning.