You are answering a USMLE-style medical question. Question: A 19-year-old man is brought to the physician by his mother because she is worried about his strange behavior. Over the past 3 years, he has been dressing all in black and wears a long black coat, even in the summer. The mother reports that her son has always had difficulties fitting in. He does not have any friends and spends most of his time in his room playing online games. He is anxious at college because he is uncomfortable around other people, and his academic performance is poor. Rather than doing his coursework, he spends most of his time reading up on paranormal phenomena, especially demons. He says that he has never seen any demons, but sometimes there are signs of their presence. For example, a breeze in an enclosed room is likely the “breath of a demon”. Mental status examination shows laborious speech. The patient avoids eye contact. Which of the following is the most likely diagnosis? Options: A) Social anxiety disorder B) Avoidant personality disorder C) Schizotypal personality disorder D) Schizophrenia Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.