A nurse is providing teaching to a school-age child who has a new diagnosed of type 1 diabetes mellitus. Which of the following statements by the child indicates a need for additional teaching?

A. Testing blood sugar before meals and at bedtime is correct and shows understanding. B. Rotating injection sites helps prevent lipodystrophy and demonstrates correct technique. C. Eating a snack before physical activity helps prevent hypoglycemia and is appropriate. D. The child should not skip insulin when sick; in fact, insulin doses often need adjustment during illness to prevent hyperglycemia and diabetic ketoacidosis, indicating a need for further teaching.