which is an example of a sphere of influence? a nation is politically independent, but an imperial power…

which is an example of a sphere of influence? a nation is politically independent, but an imperial power controls its trade. a nation is under complete political and cultural control of an imperial power. a nation is protected by an imperial power in return for trade privileges. a nation forms an alliance with an imperial power, and both reap benefits.
Answer
Brief Explanations:
A sphere of influence is when an imperial - power has significant control over another nation's economic or other affairs without complete political control. In the first option, the nation is politically independent but an imperial power controls its trade, which is a classic example of a sphere of influence. The second option is more of a colony situation. The third option is a form of a protective - trade arrangement. The fourth option is an alliance.
Answer:
A. A nation is politically independent, but an imperial power controls its trade.