Upon Entering a Patient's Room, the Licensed Practical Nurse (LPN)

Upon entering a patient's room, the licensed practical nurse (LPN) notes a white precipitate forming in the IV tubing at the site of a piggybacked antibiotic. What should the nurse do first?

A) Stop the infusion.
B) Notify the physician.
C) Call the pharmacy to see whether this is an expected reaction.
D) When the infusion is complete, remove the tubing and send it to the laboratory for analysis.