You are answering a USMLE-style medical question. Question: A 19-year-old female presents to the emergency room with 6 days of lower abdominal pain. She states that her symptoms have progressed and she now feels feverish as well. She also notes an episode of nonbloody diarrhea 2 days ago and has been increasingly nauseous. While being evaluated in the emergency room, she vomits three times. The patient has no significant past medical history but was recently treated with ciprofloxacin for an uncomplicated urinary tract infection. She also notes irregular periods, with a last menstrual period 6 weeks ago. She is a college student who has had 3 sexual partners in the last year with inconsistent use of barrier protection. Her temperature is 100.5°C (38.1°F), blood pressure is 102/68 mmHg, pulse is 97/min, and respirations are 14/min. On exam, the patient is noticeably uncomfortable. There is marked tenderness to palpation in the suprapubic region and right lower quadrant, with voluntary guarding but no rebound. Pelvic exam shows moderate purulent discharge in the vaginal vault, cervical motion tenderness, and a tender adnexal mass on the right side. Which of the following is the best next step in treating this patient’s condition? Options: A) Intramuscular ceftriaxone and oral doxycycline with outpatient follow-up B) Intravenous cefotetan and doxycycline with inpatient admission C) Oral vancomycin with outpatient follow-up D) Methotrexate with outpatient follow-up Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.