An 8-month-old infant presents to the emergency department with a 2-day history of diarrhoea and poor fluid intake. On clinical examination, capillary refill time is 3 seconds and you assess the level...

An 8-month-old infant presents to the emergency department with a 2-day history of diarrhoea and poor fluid intake. On clinical examination, capillary refill time is 3 seconds and you assess the level of dehydration as 10%. Of the following intravenous fluids, the most appropriate for immediate use is:
a. 5% dextrose with 0.45% saline
b. Normal saline
c. Lactated Ringer's
d. 5% dextrose with 0.9% saline