g to administer heparin or insulin subcutaneously, which site is preferred? a. abdomen b. scapula c. deltoid muscle d. back of the upper arm 5. what can the nurse do to ensure proper site selection for subcutaneous insulin injection? a. insert the needle at a 30-degree angle. b. select a different anatomical region for each injection. c. ask the patient to relax before inserting the needle.