A nurse is reinforcing teaching about insulin injections with a client who is newly diagnosed with type I diabetes mellitus. Which of the following information should the nurse include about site selection?

A. Use cold insulin for injection to minimize site pain: Cold insulin can increase discomfort; insulin given at room temperature is less painful. B. Insulin is absorbed most rapidly when injected in the thigh: Absorption is fastest from the abdomen, not the thigh. C. Rotate the injection site to keep insulin levels consistent: Rotating within the same general area (e.g., within the abdomen) prevents lipodystrophy and helps maintain predictable absorption and consistent insulin action. D. Massage the site after injection to promote absorption: Massaging can increase absorption unpredictably and is generally discouraged, especially with rapid-acting insulins.