Which IV Order Does the Nurse Question

Which IV order does the nurse question?

A) Flush Groshong catheter with 10 mL normal saline every 8 hours.
B) Infuse 20 mEq potassium chloride in 1000 mL D₅W at 50 mL/hr.
C) Infuse 500 mL normal saline over 1 hour.
D) Infuse 0.9% normal saline at keep vein open (KVO) rate.