The imperial system in which the ruling nation dictates and controls the policy is called the protectorate.
Option D is correct.
What is imperialism?
When the powerful country takes hold over another nation with an view to exercise dominance over the political, economic, and social scenario of the that conquered nation, then that process is defined as Imperialism. It could be done in ancient times by exercising colonial rule over the nation or using the armed forces.
Protectorate is one of form of the imperial system where the ruling state has full or partial influence over the other state. It is considered to be the dependent region where most of the internal affairs controlled by ruling state. In this system, the control lies on their outside nations and the respective colonies. It is a kind of protection given to the weaker states by the powerful states with some proportionate control.
Therefore, the imperial system mentioned in option D is correct.
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