Explain how, according to hinduism, someone can be reborn into a higher caste.

If you complete a heroic task, do something great for your empire, or do a good deed in some sort of way, you will be born to a higher cast in your reincarnated life. For example, if you were a Shudra, and you saved your king, you could be reincarnated to be a Kshatriya/Brahmin.

Explanation:

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c, they united with once

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.