The nurse is planning discharge teaching for a client with type 2 diabetes mellitus who has a new prescription for insulin glargine. Which action should the nurse plan to include in the discharge teaching?

A. Insulin glargine is a long-acting insulin and is not adjusted based on before meal blood sugar readings; it's typically administered once daily at the same time each day. B. Adjusting medication dosage for ketoacidosis is not appropriate; insulin glargine is used for baseline blood glucose control, and ketoacidosis requires specific management. C. Insulin glargine is administered subcutaneously and requires teaching on proper self-injection techniques. D. Insulin glargine is used for long-term glucose control, not for managing acute severe hypoglycemia, so teaching family injection for hypoglycemia is not relevant here.