You are answering a USMLE-style medical question. Question: A 60-year-old woman presents to the outpatient clinic complaining of severe vulvar itching that has been gradually worsening for the past year. She mentions that she has tried over-the-counter lubricants, but lubricants do not seem to provide substantial relief. Her medical history is remarkable for diet-controlled type 2 diabetes mellitus and hypertension treated with hydrochlorothiazide. Menopause occurred at 52 years of age. She has been sexually active with her husband until recently and reports severe pain during vaginal intercourse. The physical examination reveals dry, thin, white plaque-like lesions in the vulvar area with atrophy of the labia minora. The clitoris appears retracted. The perianal skin appears pale and wrinkled. Which of the following is the most likely diagnosis? Options: A) Squamous cell hyperplasia B) Lichen sclerosus C) Squamous cell carcinoma of the vulva D) Lichen planus Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.