Over six hours,a 12-year-old with newly diagnosed type 1 diabetes mellitus shows the following trends: Parameter 1000 1600 Serum blood glucose (mg/dL) 180 460 Heart rate (bpm) 113 154 Blood pressure 105/65 82/50 Respiratory rate 22 41 Respiratory pattern Regular Deep irregular What is the priority nursing action?

A. Provide oral rehydration with electrolyte solution: Oral fluids are not safe for this child due to rapid deterioration, lethargy risk, and irregular breathing. IV fluids are needed urgently to restore perfusion and correct dehydration. B. Restrict oral fluids until blood sugar stabilizes: Withholding fluids would worsen hypovolemia and shock. The child requires aggressive rehydration to address severe dehydration and circulatory collapse associated with diabetic ketoacidosis. C. Begin IV fluid resuscitation and prepare for continuous insulin infusion: The rising glucose, tachycardia, hypotension, and Kussmaul-type irregular respirations indicate diabetic ketoacidosis with impending shock. IV fluids restore circulation, and IV insulin infusion corrects hyperglycemia safely. D. Administer subcutaneous rapid-acting insulin: Subcutaneous insulin absorption is unreliable during hypoperfusion and shock. IV insulin infusion is the standard in DKA to achieve controlled glucose reduction and avoid worsening metabolic instability.