As a result of the World War I. the balance of power made a shift in Europe as Russia became the most powerful nation in Europe due to the Bolshevik Revolution.
What happened after the World War I?
The World War I came to an end in the later part of 1918. After the end of this war, there was a significant shift in the balance of power, as it also made way for the rise of Adolf Hitler in Germany.
Moreover, due to the Bolshevik Revolution in Russia, it became the most powerful nation in Europe by the end of the second decade of the twentieth century, and communism also rose in Europe.
Hence, option A holds true regarding the World War I.
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