DSM-5 Groups Adjustment Disorders,acute Stress Disorders,and Posttraumatic Stress Disorder Together

DSM-5 groups adjustment disorders,acute stress disorders,and posttraumatic stress disorder together because all are caused by stress.What makes adjustment disorder different from the other two?

A) Adjustment disorder is a reaction to a very high degree of stressor that is not life-threatening.
B) Adjustment disorder can be a reaction to a stressor of any severity.
C) Adjustment disorder is much less severe and will always get better on its own.
D) Adjustment disorder is much more severe and requires medical interventions.