The Nursing Is Caring for a Patient in Active Labor

The nursing is caring for a patient in active labor with significant back pain. The patient has requested nonpharmacologic methods of pain relief. The nurse thinks that sterile water injections may help with her pain management. Which of the following explanations should the nurse explain to the patient?

A) "We will inject 1 mL of sterile water intramuscularly, and it will last for about an hour."
B) "We will inject 0.5 mL of sterile water subcutaneously, and it will last for an hour to 90 minutes."
C) "We will inject 1 mL of sterile water subcutaneously, and it will last for about a half hour."
D) "We will inject 0.5 mL of sterile water intramuscularly, and it will last for about 3 hours."