38. Place the events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus.
(2) Oxytocin receptors increase in the uterus.
(3) Prostaglandin levels increase.
(4) Estradiol levels increase.
(5) Oxytocin levels increase.
(6) Uterine muscles start to contract.
(A) 1,2,4,5,3,6
(B) 4,2,1,5,6,3
(C) 5,2,4,1,3,6
(D) 1,6,4,2,5,3
(E) 4,3,1,2,5,6