You are answering a USMLE-style medical question. Question: A 28-year-old primigravid woman at 39 weeks gestation is admitted to the hospital in active labor. On examination, the cervix is 100% effaced and 10 cm dilated. After 5 minutes of pushing, there is a prolonged deceleration of the fetal heart rate to 90/min. A decision to perform an episiotomy is made to expedite vaginal delivery. The anesthesiologist locates the ischial spines by palpating the posterolateral vaginal sidewall and administers an anesthetic. Three minutes later, pinching the posterior vulva does not provoke pain. The anesthetized nerve most likely also supplies which of the following structures? Options: A) Skin of the lateral thigh B) External anal sphincter C) Skin of the mons pubis D) Detrusor muscle Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.