You are answering a USMLE-style medical question. Question: A 16-year-old girl is brought to the physician by her father because of concerns about her behavior during the past 2 years. She does not have friends and spends most of the time reading by herself. Her father says that she comes up with excuses to avoid family dinners and other social events. She states that she likes reading and feels more comfortable on her own. On mental status examination, her thought process is organized and logical. Her affect is flat. Which of the following is the most likely diagnosis? Options: A) Schizoid personality disorder B) Antisocial personality disorder C) Schizophreniform disorder D) Autism spectrum disorder Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.