The Nurse Is Teaching the Client to Administer a Dose

The nurse is teaching the client to administer a dose of 10 units of regular insulin and 28 units of NPH insulin. Which of the following statements by the client indicates a need for additional instruction?

A) "I need to rotate injection sites among my arms, legs, and abdomen each day."
B) "I will buy the 0.5 mL syringes because the line markings will be easier to see."
C) "I should draw up the regular insulin first after injecting air into the NPH bottle."
D) "I do not need to aspirate the plunger to check for blood before injecting insulin."