The correct option is A Endometrium
Uterus has a thick, highly vascular wall composed of three layers;
Outer perimetrium - thin covering of uterine wall
Middle myometrium - layer of smooth muscle fibers that contract strongly during the delivery of the baby
Inner endometrium - an inner glandular layer containing glands and blood vessels
Fallopian tubes are not a uterine layer.
Hence, the endometrium is the correct answer.