You are answering a USMLE-style medical question. Question: A 27-year-old G3P1010 makes an appointment with her gynecologist for evaluation of profuse bleeding, which began two days ago. She is 13 weeks pregnant based on the date of her last menstrual period. She is dizzy and weak, and is unable to move around the house and perform her daily tasks. Initially, she had only light spotting, but later on in the day the bleeding increased. Thus far, she has used six sanitary pads. The blood pressure is 90/60 mm Hg, the temperature is 37.8°C (100°F), the pulse is 125/min, and the respiratory rate is 14/min. A saline infusion is started, and blood and urine specimens are sent for analysis. On pelvic examination, the vagina contains blood and the cervical os is open. She also complains of cervical motion and adnexal tenderness on examination. An ultrasound shows an intrauterine gestational sac low in the uterine cavity. No fetal movement or cardiac activity are observed. She is advised to rest for a couple of hours, after which the scan is repeated. Slight downward migration of the gestational sac is observed with no change in the fetal status. Which of the following is the next step in management? Options: A) Antibiotics B) Magnesium sulfate C) Methotrexate D) Dilation and curettage Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.