Which Statement About Events During Childbirth Is True

Which statement about events during childbirth is true?

A) Progesterone stimulates and estrogen inhibits contractions of uterine muscle.
B) Mechanical stimuli increase the release of luteinizing hormone (LH) by the posterior pituitary.
C) The onset of labor is controlled solely by hormonal stimuli.
D) The onset of labor is marked by increased oxytocin secretion by the pituitaries of both mother and fetus.
E) The third (last) stage of labor ends with delivery of the baby.