Answer:
A. core nations.
Step-by-step explanation:
Core nations are the nations that control the global market system. As the name suggests the core countries have strong economies and political structures on which the peripheral or semi-peripheral nations were dependent. They are the wealthiest countries with better institutions. But with changing time the designation of core countries also change as the European countries were core countries till the twentieth century when the designation was shifted to the Soviet Union and the United States.