Well, I would have to say that your answer is going to be B) The Ruler
This is because if you think about it the ruler of a kingdom has to make decisions for the greater good of the kingdom or country.
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WWII America watched everyone fight it out and when Germany was about to lose came in and stole the credit
The destruction of Europe again completely made Europe weaker than US.
Distrust of the Russians, US refused to help the USSR when they could have easily done so to build up trust.
So in the end the only superpowers remaining were the US and USSR and in any situations there can only be 1 leader of a world. Both competed to be the best which leads to the arm race and the cold war. But soon the US outcompeted them and became what it is today.
The world superpower that creates a mess all over the world to promote its own interests
I would say big business or businessmen.