You are answering a USMLE-style medical question. Question: A 38-year-old woman presents to the office for a routine examination. She has no complaints and offers very little information voluntarily. She answers each question with soft, short sentences and avoids eye contact. She appears timid, anxious and admits that this is one of the very few times she has left the house in the last several years. Medical history is significant for essential hypertension. She takes hydrochlorothiazide and a daily vitamin. She has worked from home as a web graphic designer for 20 years. Questions about her social life reveal that she is very shy with few friends, and she often makes excuses to avoid parties and social gatherings. Despite this, she expresses a strong desire to be in a relationship. Today, her blood pressure is 125/85 mm Hg, heart rate is 95/min, respiratory rate is 18/min, and temperature is 37.0°C (98.6°F). On physical examination, her heart has a regular rhythm and her lungs are clear to auscultation bilaterally. Which of the following is most consistent with her behavior? Options: A) Schizoid personality disorder B) Avoidant personality disorder C) Antisocial personality disorder D) Agoraphobia Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.