A Soldier in a Combat Zone Tells the Nurse, "I

A soldier in a combat zone tells the nurse, "I saw a child get blown up over a year ago, but I keep seeing bits of flesh everywhere.I see something red and the visions race back to my mind." The soldier is describing which phenomenon associated with PTSD?

A) Re-experiencing
B) Hyperarousal
C) Avoidance
D) Psychosis