A 5 year old boy passed 18 loose stools in last 24 hours and vomited twice in last 4 hour.He is irritable but drinking fluids.The optional therapy for this child is :

• A. Oral rehydration therapy
• B. Intravenous fluids
• C. Plain water and libitum
• D. Intravenous fluid initially for 4 hrs followed by oral fluids