Dana has experienced a number of unpredictable,short periods in which she suddenly feels terrified and thinks she is going to faint.Dana is most likely suffering from

A) social anxiety disorder.
B) depression.
C) obsessive-compulsive disorder.
D) panic disorder.

Dana's symptoms are consistent with those of panic disorder, which is characterized by sudden and unexpected panic attacks that cause intense fear and physical symptoms such as sweating, trembling, and dizziness. Social anxiety disorder and obsessive-compulsive disorder typically involve more persistent worries or specific fears, whereas depression may involve feelings of sadness and hopelessness but typically not panic attacks.