Which Disorder Is Best Characterized by Excessive or Unrealistic Apprehension

Multiple Choice

Which disorder is best characterized by excessive or unrealistic apprehension that causes physical symptoms,such as restlessness,fatigue,and muscle tension,and lasts for six months or longer? 

A)  ​panic disorder 
B)  ​major depressive disorder 
C)  ​generalized anxiety disorder 
D)  ​obsessive-compulsive disorder 
E)  ​bipolar disorder