You are answering a USMLE-style medical question. Question: A 35-year-old woman comes to the physician for genetic counseling prior to conception. Her younger brother has mild developmental delay, pale complexion, and has to limit his dietary intake of phenylalanine. She has no similar symptoms and is in good health. Her parents are healthy. Which of the following is the most appropriate assessment of her carrier status for the disease affecting her brother? Options: A) 67% B) 100% C) 75% D) 50% Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.