You are answering a USMLE-style medical question. Question: A 56-year-old patient is being treated with oral amoxicillin for community-acquired pneumonia. The plasma clearance of the drug is calculated as 15.0 L/h. Oral bioavailability of the drug is 75%. Sensitivity analysis of a sputum culture shows a minimal inhibitory concentration of 1 μg/mL for the causative pathogen. The target plasma concentration is 2 mg/L. If the drug is administered twice per day, which of the following dosages should be administered at each dosing interval to maintain a steady state? Options: A) 270 mg B) 480 mg C) 240 mg D) 540 mg " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.