A 62-year-old male with a history of hypertension and diabetes presents with a 7-day history of fever, worsening shortness of breath, and cough. His oxygen saturation is 88% on room air, and a chest X-ray shows bilateral infiltrates. A PCR test is positive for SARS-CoV-2. What is the most appropriate next step in managing this patient?

• A. Discharge with home oxygen therapy
• B. Start corticosteroids and supplemental oxygen
• C. Initiate high-dose vitamin C
• D. Administer convalescent plasma