Which Statement Regarding the Care of a Client in Labor

Which statement regarding the care of a client in labor is correct and important to the nurse in the formulation of the plan of care?

A) The woman's blood pressure will increase during contractions and fall back to prelabor normal levels between contractions.
B) The use of the Valsalva maneuver is encouraged during the second stage of labor to relieve fetal hypoxia.
C) Having the woman point her toes will reduce leg cramps.
D) Endogenous endorphins released during labor will raise the woman's pain threshold and produce sedation.