After the Home Health Nurse Has Taught a Patient and Family

After the home health nurse has taught a patient and family about how to use glargine and regular insulin safely, which action by the patient indicates that the teaching has been successful?

A) The patient disposes of the open insulin vials after 4 weeks.
B) The patient draws up the regular insulin in the syringe and then draws up the glargine.
C) The patient stores extra vials of both types of insulin in the freezer until needed.
D) The patient's family prefills the syringes weekly and stores them in the refrigerator.