Research on Evoked Potential with People with Dissociative Identity Disorder

Research on evoked potential with people with dissociative identity disorder has revealed that:

A) different subpersonalities have shown different brain response patterns.
B) people with dissociative identity disorder did not show different brain response patterns for subpersonalities.
C) no differences were found in brain activity between controls and individuals with dissociative identity disorder.
D) control subjects who were asked to pretend they had different personalities were able to create different brain response patterns for each subpersonality.