A child allergic to insect stings presents to the school nurse stating, "A bee stung me on the playground." Which action by the school nurse should be prioritized?

A. Applying topical diphenhydramine may help with local itching but is not the priority in a child with a known allergy to insect stings. B. A cool pack can reduce swelling but is not the priority action if an allergic reaction is suspected. C. Positioning the child with legs elevated is appropriate if there are signs of shock but does not address the immediate risk of airway compromise. D. Assessing the client's airway and breathing rate is the priority because a child with a known allergy to insect stings is at risk for anaphylaxis, which can cause airway obstruction and respiratory distress. Early recognition and intervention are critical.