One Reason That Infants Are More Vulnerable to Fluid and Electrolyte

One reason that infants are more vulnerable to fluid and electrolyte imbalances than adults is that:

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.