Some of the Embryo's Intestines Remain Within the Umbilical Cord

Some of the embryo's intestines remain within the umbilical cord during the embryonic period because the

A) intestines need this time to grow until week 15.
B) nutrient content of the blood is higher in this location.
C) abdomen is too small to contain all the organs while they are developing.
D) umbilical cord is much larger at this time than it will be at the end of pregnancy.