Carolina is using world-systems theory to research resource-rich countries that tend to send resources to the wealthiest nations, which then sell them back to those countries for a profit. She is studying what kind of countries?

Peripheral Countries

Explanation:

Resource-rich countries that tend to send resources to the wealthiest nations, which then sell them back to those countries for a profit are peripheral countries.

Periphery countries are those which possess a marginal portion of the world's wealth, and are dependent on developed capitalist nations which has led to their exploitation.

world-systems theory tends to highlight the issue of global inequality among nations of the world

the correct answer is b.)