Emily Has Barricaded Herself in Her Home

Emily has barricaded herself in her home. She believes that aliens are trying to take over her mind and body. She has wrapped herself in aluminum foil in order to prevent the penetration of the cosmic rays that she has "seen" coming down through her ceiling. Emily believes that she alone has been given the power by God to tell real humans from aliens pretending to be humans so she can destroy them. Emily is exhibiting the delusions and hallucinations often seen in

A) paranoid psychosis.
B) a conversion disorder.
C) dissociative identity disorder.
D) schizophrenia.