The placenta is
a. the tube through which a developing baby receives nourishment
b. the technical name for the "belly button"
c. a specialized organ that provides nourishment and filters away waste products from the developing baby
d. the name for the developing organism until it is 8 weeks old
e. the name for the developing organism after it is 8 weeks old

A specialized organ that provides nourishment and filters away waste products from the developing baby (Ans. C)

Explanation:

Placenta is an organ that forms in womb during pregnancy, placenta attached to the top or side wall of the uterus. The placenta connects to the fetus through Umbilical cord. In the womb baby is present inside a bag of fluid known as Amniotic Sac.

Placenta transfer the nutrients and oxygen between fetus and mother, the umbilical cord carrier the nutrients and oxygen to the fetus and remove  waste product (carbon dioxide) from fetus pass back through the umbilical cord to the placenta and then into the bloodstream.

So, the correct ans. is C.

most community's take hundreds of years to become stable

b is the correct answer