You are answering a USMLE-style medical question. Question: An 8-year-old girl presents to the emergency department with respiratory distress, facial edema, and a skin rash after eating a buffet dinner with her family. She was born at 39 weeks via spontaneous vaginal delivery, has met all developmental milestones and is fully vaccinated. Past medical history is significant for mild allergies to pet dander and ragweed, as well as a severe peanut allergy. She also has asthma. She normally carries both an emergency inhaler and EpiPen but forgot them today. Family history is noncontributory. The vital signs include: blood pressure 112/87 mm Hg, heart rate 111/min, respiratory rate 25/min, and temperature 37.2°C (99.0°F). On physical examination, the patient has severe edema over her face and an audible stridor in both lungs. Of the following options, which is the most appropriate next step in the management of this patient? Options: A) IM epinephrine B) oral diphenhydramine C) extra-strength topical diphenhydramine D) inhaled sodium cromolyn - mast cell stabilizer Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.