Mel Believes That People Are Spying on Him and Plotting

Mel believes that people are spying on him and plotting against him. A stranger that comes to his door asking for directions is "really trying to get information," while static sounds during a telephone conversation is "really someone recording the phone call." So, Mel feels like he must be on guard at all times. Mel is suffering from

A) schizophrenia.
B) paranoid psychosis.
C) the erotomanic type.
D) the histrionic type.