Which Precaution Is Most Important to Teach a Patient Who

Which precaution is most important to teach a patient who is receiving intravenous (IV) drug therapy?

A) "Turn on your call light if the IV machine starts to beep for any reason."
B) "Do not use the arm that has the IV running in it for any reason whatsoever."
C) "Call me immediately if you start to feel any pain or burning in the arm with the IV."
D) "If you think the IV is running too slowly,just push the up-arrow button on the machine once or twice."