The practical nurse (PN) is observing a client self-administer the noon dose of subcutaneous insulin. Which component of the injection technique should the PN reteach?
A. Uses a circular action when applying an alcohol pad to the site.
B. Inserts the needle at a 90-degree angle to the skin surface.
C. Selects the same site that was used for the previous injection
D. Injects air into the insulin vial to displace the dose.