A nurse is providing teaching about self-administration of insulin to the parent of a school-age child who has a new of diabetes mellitus. Which of the following statements by the parent indicates a need for further teaching?

A. Rotating injection sites is important to prevent lipodystrophy; rotating after several injections in one area is appropriate. B. Insulin should be injected into subcutaneous tissue, typically in areas with sufficient adipose tissue, which is correct. C. Aspiration (pulling back the plunger to check for blood) is no longer recommended for subcutaneous insulin injections because the risk of injecting into a blood vessel is very low; this statement indicates a need for further teaching. D. Injecting insulin at a 90-degree angle is correct for most school-age children, especially when using short needles, to ensure proper subcutaneous delivery.