The decidua is which of the following? A. Endometrium that is thickened and modified by the effect of progesterone B. Fetal urine and a small amount of fluid and cell debris issuing from the fetal...

The decidua is which of the following?

A. Endometrium that is thickened and modified by the effect of progesterone

B. Fetal urine and a small amount of fluid and cell debris issuing from the fetal bowel

C. A maternal blood vessel that serves as an exchange device for transfer of nutrients and oxygen

D. Composed of finger-like projections containing fetal blood vessels that extend into lakes of maternal blood