You are answering a USMLE-style medical question. Question: A 24-year-old woman comes to the physician because she had unprotected intercourse with her boyfriend the previous day. She has had regular menses since menarche at the age of 12. Her last menstrual period was 3 weeks ago. She has no history of serious illness but is allergic to certain jewelry and metal alloys. She takes no medications. A urine pregnancy test is negative. She does not wish to become pregnant until she finishes college in six months. Which of the following is the most appropriate next step in management? Options: A) Insert copper-containing intra-uterine device B) Administer mifepristone C) Administer ulipristal acetate D) Administer depot medroxyprogesterone acetate Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.