A child suffering from acute diarrhoea is brought to the casualty and is diagnosed as having severe dehydration with pH of 7.23. Serum Na-125,Serum K-3,HCO3 -16. The best I.V. fluid of choice is

• A. 3% Saline
• B. N/3 Saline + 10% dextrose
• C. Normal saline
• D. N/3 saline + 5% dextrose