How did the success of west african kingdoms contribute to the development of kingdoms in western and southern africa?

as the populations of western kingdoms grew, overpopulation caused citizens to migrate east and south to build new empires.

as people from other continents came to find jobs in western empires, native citizens moved east and south to preserve their culture.

as the agricultural land available became depleted in western empires, citizens moved east and south to find fertile land.

as the natural resources and goods for trade dried up in western empires, citizens m

Western kingdoms in Africa were successful and became overpopulated quickly. Overpopulation created a flow of migration to other areas of Africa. Since these people migrated to the east and south, considering new resources and developments that those people brought with them, these areas where people migrated to ended up becoming way more developed very quickly.

Considering that, it wasn't because of people from other continents, the search of new fertile ground or the end of the resources in the Western Kingdoms, but the overpopulation. The answer that correct represents this is the following:

As the populations of western kingdoms grew, overpopulation caused citizens to migrate east and south to build new empires.

b) brahmans   is nomadic society

c) legal battles last five weeks after the election due to the narrow victory in several states.