Heather has suddenly left home and has lost all memory of herself and her past life. She is most likely suffering from

A) repression.
B) depersonalization/derealization disorder.
C) dissociative amnesia.
D) dissociative amnesia with fugue.
E) dissociative identity disorder.

Heather's sudden departure and loss of memory suggest that she may be experiencing dissociative amnesia with fugue. This involves not only memory loss but also a sudden change in location and the assumption of a new identity. Repression involves unconsciously pushing unpleasant memories out of conscious awareness, depersonalization/derealization disorder involves feeling detached from oneself or one's surroundings, dissociative identity disorder involves the presence of two or more distinct identities or personalities, and dissociative amnesia involves memory loss without the additional fugue state experienced in dissociative amnesia with fugue.