International voluntary migration

a. is insignificant now compared to prehistoric times.
b. is most likely to be from the periphery to the core.
c. is done typically for religious reasons.
d. is usually coordinated by the united nations.
e. is a combination of all of the above.

B. Is most likely to be from the periphery to the core.

Explanation:

Emmanuel Wallenstein developed the World systems theory to understand world history and social change in relation to the economy. according to this theory theory in world economic system some countries are exploited while others benefit.

He devised a three level hierarchy and divided various areas around the globe into core, periphery and semi-periphery areas. The peripheral countries are exploited by the core countries for raw materials, labour and dominated them, while the core counties are dependent on the core countries for capital.

The semi peripheral countries have characteristic of both the peripheral and core countries.

This theory explained the social structure of global inequality. People migrate from peripheral countries to core countries to get a better life.

pretty sure they split up because of religious conflicts.