When the discussion turns to his recently deceased father, Ed gets a blank stare on his face and leaves the room. His wife notices that his mannerisms and his language become very gruff. Sometimes during these spells, Ed goes out into the night claiming he needs to take a ride. When later questioned about what he had done when he went out, Ed has no recall of even leaving. Ed may very well have

A) Briquet's syndrome.

B) Munchausen's syndrome.

C) conversion disorder.

D) dissociative identity disorder.