The Physician Has Ordered 6 Mg of Morphine Sulfate Every

The physician has ordered 6 mg of morphine sulfate every 3 to 4 hours prn for a client's postoperative pain.The unit dose in the medication dispenser has 15 mg in 1 mL.How much solution should the nurse give?

A) 1/5 mL
B) 1/3 mL
C) 2/5 mL
D) 1/4 mL