After Morning Care, the Nurse Lowered the Height of the IV

After morning care, the nurse lowered the height of the IV container infusing via gravity flow, at the client's request. What is the nurse's next best action?

A) Calculate the new infusion rate.
B) Readjust the infusion rate, as needed.
C) Change the IV site and move it to the other arm.
D) Instruct the client to call when the IV bag is empty.