Which of the following statements are true of labor and delivery? (Read carefully and select all of the correct statements.)

A)The hormone oxytocin from the anterior pituitary promotes strong contractions of the myometrium.
B)The uterine cervix dilates during the first stage of labor.
C)The amniotic sac ruptures during the second stage of labor.
D)If the fetus is positioned sideways, the third stage of labor will be prolonged.
E)The placenta is delivered soon after the delivery of the infant.
F)Decreasing progesterone at the end of gestation increases the contractility of the myometrium.