Which Finding Is Most Important for the Nurse to Confirm

Which finding is most important for the nurse to confirm prior to hanging an intravenous (IV) bag containing potassium?

A) Verify a blood pressure of at least 60 mm Hg diastolic.
B) Check for urine output of at least 30 mL/hr.
C) Ensure filter placement on the IV line.
D) Verify a pulse of at least 50 beats/min.