John Describes Himself as Feeling Tense, Nervous, and on Edge

John describes himself as feeling tense, nervous, and on edge. He is restless and has problems sleeping He often experiences restlessness and muscle tension. He says that he seems to worry about everything, including finances, whether his family is eating a proper diet, his job performance, and whether people like him. What diagnosis would John most likely be given?

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