War Veterans and Victims of Violent Attacks May Experience Nightmares

War veterans and victims of violent attacks may experience nightmares, anger, and anxiety long after their exposure to violence. One reason is that

A) they have neither sympathetic nor parasympathetic nervous system responses.
B) brief reminders of the tragic experience trigger flashbacks.
C) they are still in the alarm phase of the response to stress.
D) they make little effort to understand their present surroundings.