A Soldier Returned Home from Active Duty in a Combat

A soldier returned home from active duty in a combat zone in Afghanistan and was diagnosed with posttraumatic stress disorder (PTSD) .The soldier says,"If there's a loud noise at night,I get under my bed because I think we're getting bombed." What type of experience has the soldier described?

A) Illusion
B) Flashback
C) Nightmare
D) Auditory hallucination