The Nurse Observes the Student Administer Heparin Subcutaneously into the Client's

The nurse observes the student administer heparin subcutaneously into the client's abdomen.Which action indicates the need for further teaching?

A) The student determines the site by placing two fingers above the umbilicus and injecting the medication above the fingers.
B) The student cleans the site,wiping in a circular motion with an antimicrobial wipe.
C) The student uses a 25 gauge needle.
D) The student inserts the needle at a 90° angle.