The Patient Is Having an Unmedicated Childbirth and Has Begun

The patient is having an unmedicated childbirth and has begun to bear down. She vocalizes, "The baby is coming!" Which action should the nurse take?

A) Help the patient in a lithotomy position.
B) Help the patient onto all fours.
C) Have the patient assume a comfortable and upright position.
D) Help the patient into a knee-chest position.