You are answering a USMLE-style medical question. Question: A 16-year-old boy is rushed to the emergency room with acute vomiting and abdominal pain that began earlier today. His parents say that the boy was doing well until two days ago when he told them that he was feeling unwell. He has diabetes and takes insulin but stopped taking it when he began to feel poorly two days ago. His temperature is 37°C (98.6°F), respirations are shallow and rapid with a rate of 33/min, pulse is 107/min, and blood pressure is 101/68 mm Hg. He appears severely dehydrated, showing signs of fatigue, and poor skin turgor. His breath has a fruity smell to it. His blood glucose level is 691 mg/dL. Blood is drawn for labs and the results are given below: Serum: pH: 7.21 pCO2: 32 mm HG HCO 3-: 15.2 mEq/L Sodium: 122 mEq/L Potassium: 5.8 mEq/L Urinalysis is positive for ketone bodies. What is the most appropriate immediate step in the management of this patient? Options: A) Administer IV fluids and insulin B) Administer IV antibiotics C) Administer IV fluids with oral antidiabetic medications D) Administer potassium and magnesium Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.