Sandile sought treatment as he was remarkably distressed and suicidal during a robbery six months ago. He witnessed his wife being raped and shot on their farm. For the past three months, Sandile, now a widower, finds himself having flashbacks of that night and reports feeling on edge at the slightest noise and being unable to sleep properly. He also finds that he avoids the room in which the shooting happened (he locked it the day after the police removed his wife’s body), and he has been absent from work on most days. Sandile reports feeling emotionally numb but, when prompted, admits he wishes he had been assaulted and shot instead. He feels guilty for not stopping the ringleader at the farm gate, whom he had found suspicious. He sits on his porch and has neglected the harvest. Sandile is not abusing any substances and barely eats. Before the traumatic event, Sandile was regarded by his employees and friends as healthy and full of life. Which of the following DSM-5 TR diagnoses would the psychologist diagnose?