A nurse is caring for a 7-month-old infant who is being treated for severe dehydration. Which of the following assessment findings indicates the treatment was effective?

Choice A reason: A flat anterior fontanel indicates adequate hydration. In dehydration, the fontanel becomes sunken, so normalization shows effective treatment. Choice B reason: Skin turgor displaying tenting is a sign of persistent dehydration, not improvement. Choice C reason: Hyperpnea (rapid breathing) suggests metabolic acidosis or ongoing fluid imbalance, not resolution. Choice D reason: Cool, mottled skin indicates poor perfusion and continued dehydration, not effective treatment.