Several Weeks After Being Fired from a Job He Had

Several weeks after being fired from a job he had held for more than 20 years, Landon awoke one morning in a state of bewildered confusion. He had little sense of who he was and even failed to recognize his wife. Landon's experience is most indicative of

A) a dissociative disorder.
B) generalized anxiety disorder.
C) panic disorder.
D) catatonia.