The Nurse Is Teaching a Patient to Self-Administer Insulin

The nurse is teaching a patient to self-administer insulin.Which of the following does the nurse include in patient teaching?

A) Insert the needle into abdominal tissue at a 90-degree angle.
B) Include an air space when drawing up the prescribed dose.
C) Aspirate before injecting to ensure that the needle is not in a vessel.
D) Instruct the patient to use an insulin syringe with a 1-inch needle.