A 38-year-old woman from Delhi presents to the emergency department with a 3-day history of sudden-onset fever (39.5°C), severe myalgia, headache, and dry cough. She reports that her 6-year-old son had similar symptoms 5 days ago. On examination, she is febrile, tachycardic (HR 110/min), and has clear lung fields. Rapid influenza diagnostic test (RIDT) is positive. Chest X-ray is normal. Which of the following antiviral agents is most appropriate for this patient if started within 48 hours of symptom onset?