Help ill give brainlest pls

A

Explanation:

The Catholic Church became very rich and powerful during the Middle Ages. ... Eventually, the church owned about one third of the land in Western Europe. Because the church was considered independent, they did not have to pay the king any tax for their land. Leaders of the church became rich and powerful.

couples could only have one child to reduce the population growth.

answer; /// i believe that the correct answer is (d)the huang he river valley;