What Is the Most Appropriate Statement from the Nurse When

What is the most appropriate statement from the nurse when coaching the laboring woman with a fully dilated cervix to push?

A) "At the beginning of a contraction,hold your breath and push for 10 seconds."
B) "Take a deep breath and push between contractions."
C) "Begin pushing when a contraction starts and continue for the duration of the contraction."
D) "At the beginning of a contraction,take two deep breaths and push with the second exhalation."