You are answering a USMLE-style medical question. Question: A 55-year-old woman with no significant past medical history presents to her primary care doctor with fever, fatigue, and bleeding gums for the past 3 days. She denies any sick contacts. Her temperature is 101°F (38.3°C), blood pressure is 110/70 mmHg, pulse is 96/min, and respirations are 15/min. Physical exam reveals several oral mucosal petechiae, bleeding gums, bilateral submandibular lymphadenopathy, and hepatosplenomegaly. Initial laboratory workup shows the following: Leukocyte count and differential: Leukocyte count: 6,600/mm^3 Segmented neutrophils: 60% Bands: 20% Eosinophils: 9% Basophils: 1% Lymphocytes: 0% Monocytes: 10% Platelet count: 99,000/mm^3 Hemoglobin: 8.1 g/dL Hematocrit: 25% Prothrombin time: 25 sec Partial thromboplastin time: 50 sec International normalized ratio: 1.6 D-dimer: 2,000 µg/mL Fibrinogen: 99 mg/dL A bone marrow biopsy demonstrates 34% myeloblasts with Auer rods that are myeloperoxidase positive. What is best treatment option? Options: A) Ascorbic acid B) Fresh frozen plasma C) Retinoic acid D) Zoledronic acid Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.