While Administering an Intramuscular Injection,the Nurse Notes Blood Return in the Syringe

While administering an intramuscular injection,the nurse notes blood return in the syringe barrel after aspirating.What action should the nurse take?

A) Pull the needle out 0.5 cm and inject the medication
B) Inject the medication as ordered
C) Notify the physician immediately
D) Discard the medication and start over