Mr.Santo has not left his home for 10 years for fear of having a panic attack.When he does think of leaving his home,he begins to hyperventilate,shake,and experience chest pains.Mr.Santo has the symptoms of

A) panic disorder.
B) obsessive-compulsive disorder.
C) generalized anxiety disorder.
D) agoraphobia.

Mr. Santo's fear of leaving his home for 10 years and experiencing panic symptoms such as hyperventilating, shaking, and chest pains indicate that he has developed agoraphobia, which is the fear and avoidance of situations or places that may cause panic or embarrassment. This is different from panic disorder, which involves unexpected and recurrent panic attacks without a specific trigger. Obsessive-compulsive disorder involves intrusive and repetitive thoughts and behaviors, while generalized anxiety disorder involves excessive worrying and anxiety about various everyday situations or events.