[单项选择]Before bowel surgery, the infant is to receive oral neomycin for 3 days. The appropriate pediatric dosage of neomycin sulfate is 10. 3 mg/kg q 4 hours. The infant weighs 15 pounds, 6.4 ounces. Which of the following dosages most closely approximates a safe daily dose() A. 50 mg/day. B. 150 mg/day. C. 280 mg/day. D. 430 mg/day.