You are answering a USMLE-style medical question. Question: A 62-year-old woman comes to the physician for a routine health maintenance examination. She feels well. Six months ago, she was vaccinated against influenza. Her last mammography 1 year ago showed no abnormalities. Two years ago, a pap smear and colonoscopy were normal. She has a history of hypertension. Her father died of a myocardial infarction at the age of 50 years. She emigrated from Japan 30 years ago. She has smoked one-half pack of cigarettes daily for the last 18 years. She drinks 4–5 glasses of wine per day. She goes ballroom dancing twice each week. Her medications include enalapril and low-dose aspirin. She is 165 cm (5 ft 5 in) tall and weighs 50 kg (110 lb); BMI is 18 kg/m2. Vital signs are within normal limits. Cardiopulmonary examination shows a soft S4 gallop. The remainder of the examination shows no abnormalities. Which of the following is the most appropriate next step in management? Options: A) Pap smear B) Dual-energy x-ray bone absorptiometry C) Abdominal ultrasonography D) Transesophageal echocardiography Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.