A nurse is teaching a school-age child who has type 1 diabetes mellitus and his parents about illness management. Which of the following instructions should the nurse include?

A. Testing urine for ketones is important during illness as it can indicate the presence of ketoacidosis, a potentially life-threatening complication in children with type 1 diabetes. B. Withholding insulin during illness is dangerous, as the body may require more insulin due to increased stress and glucose production. C. While notifying the provider for high blood glucose levels is essential, it is not the first action to take. Monitoring for ketones is crucial during illness. D. Limiting fluid intake is not advised during illness, as adequate hydration is important to prevent dehydration and assist in glucose regulation.