A6-week-old infant with pyloric stenosis is scheduled for a pyloromyotomy, Which pre- operative nursing action has highest priority?

A. Marking an outline of the "olive-shaped mass" in the right epigastric area is important for diagnosis, but not a priority pre-operatively. B. Initiating a continuous infusion of IV fluids is crucial to ensure the infant is properly hydrated before the procedure, as pyloric stenosis can cause severe dehydration. C. Monitoring the amount of intake and the infant's response to feedings is part of ongoing care, but immediate pre-operative hydration takes precedence. D. Instructing parents regarding care of the incisional area is necessary post-operatively, not before the surgery.