People who experience flashbacks, nightmares, and impaired functioning following a life-threatening or other horrifying event are .

experiencing posttraumatic stress disorder is the correct answer.

Explanation:

Posttraumatic stress disorder is a severe mental disorder that develops when someone has faced terrifying events such as severe accidents, the sudden death of their family member, war, terrorist event,sexual assault, and natural disaster.

Symptoms of Posttraumatic Stress Disorder are

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