Which intervention should be included in the plan of care for an infant with the nursing diagnosis Fluid Volume Excess related to congestive heart failure?

A. Digoxin improves cardiac contractility but does not directly assess fluid volume status. B. A gain of 20g/day is often a normal weight gain in infants; excessive gain is typically considered >50g/day in the context of fluid retention. C. Daily weights on the same scale at the same time are the most accurate method to assess fluid volume status in CHF. D. Using a car seat may increase energy expenditure in some infants and is not a routine intervention for CHF.