Which disorder can only be caused by direct exposure to a stressor

A)  anxiety disorders
B)  post-traumatic stress disorder 
C)  depression
D)  schizophrenia

Direct Exposure

The process of experiencing or being in contact with a stimulus or factor in its natural or intended environment.

Post-Traumatic Stress Disorder

A psychological disorder that develops after being exposed to or witnessing a horrifying event, marked by intrusive memories, distressing dreams, and intense fear.

Stressor

An event, situation, or stimulus that causes stress or strain on an individual.