You are answering a USMLE-style medical question. Question: A 16-year-old healthy female presents to her pediatrician concerned that she has not had a menstrual period. She has no past medical history and takes no medications. She plays volleyball and gets good grades in school. Her BMI is 22 kg/m2. Physical examination reveals normal female external genitalia and pubic hair along the mons pubis and superomedial thighs. Her breasts appear normal. Transabdominal ultrasound reveals an absent uterus. Serum testosterone levels is within the normal range for females. What is the most likely cause of this patient’s condition? Options: A) Pituitary tumor B) Absence of second X chromosome C) Androgen receptor mutation D) Failure of paramesonephric duct development Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.