Why Are Infants More Vulnerable to Fluid and Electrolyte Imbalances

Why are infants more vulnerable to fluid and electrolyte imbalances than adults?

A) They have a smaller surface area than adults in proportion to body weight.
B) Water needs and losses per kilogram are lower than those for adults.
C) A greater percentage of body water in infants is extracellular.
D) Infants have a lower metabolic turnover of water.