When Driving to Work, Darren Believes That He Is Receiving

When driving to work, Darren believes that he is receiving a secret message from the government through his car radio. He spends most of his days trying to warn others about an impending invasion from outer space that the voice on his radio has been telling him about. Darren is most likely suffering from

A) major depressive disorder.
B) a specific phobia.
C) antisocial personality disorder.
D) schizophrenia.