The Physician Orders Demerol 50 Mg IV Every 2 Hours

The physician orders Demerol 50 mg IV every 2 hours PRN for pain.The medication comes in a single-dose ampule with 75 mg/mL.Which of the following represents the amount that the nurse will give the patient?

A) 1.5 mL
B) 0.50 mL
C) 0.66 mL
D) 1.2 mL