单选题 The nurse plans to administer an injection of heparin to a client. Which of the following techniques for heparin administration is appropriate?
A. Selects a 1.5-inch, 21-gauge needle for the injection.
B. Makes the injection into the deltoid muscle.
C. Applies gentle pressure to the site for 5 to 10 seconds after the injection.
D. Aspirates with the plunger to check for entry into the blood vessel before injecting the heparin.