Which Statement Correctly Describes the Effects of Various Pain Factors

Which statement correctly describes the effects of various pain factors?

A) Higher prostaglandin levels arising from dysmenorrhea can blunt the pain of childbirth.
B) Upright positions in labor increase the pain factor because they cause greater fatigue.
C) Women who move around trying different positions experience more pain.
D) Levels of pain-mitigating beta-endorphins are higher during a spontaneous,natural childbirth.