A 3-year-old boy presents with a 2-day history of vomiting and diarrhoea. He has mild sunken eyes and dry mucous membranes but is alert and drinking. His weight is 15 kg. What is the preferred initial rehydration strategy?AIntravenous 0.9% sodium chloride bolus 20 mL/kgBIntravenous 5% dextrose maintenance onlyCOral rehydration solution 1 mL/kg every 5-10 minutesDNil by mouth with antiemetics onlyEClear fluids such as undiluted apple juice ad libitumCheck my answer