Answer:

A. Sphere of Influence

Explanation:

In the field of international relations, a sphere of influence (SOI) is a spatial region or concept division over which a state or organization has a level of cultural, economic, military, or political exclusivity.

Sphere of influence, in international politics, the claim by a state to exclusive or predominant control over a foreign area or territory.

For another example, during the height of its existence in World War II, the Japanese Empire had quite a large sphere of influence. The Japanese government directly governed events in Korea, Vietnam, Taiwan, and parts of Mainland China.