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I think the answer is C, a large supply of soldiers.
Let me know if its wrong
The factor was most important in enabling Russia to fight in world war 1 for as long as it did Option C a large supply of soldiers.
Russia joined World War I in the three days succeeding July 28, 1914—beginning with Austria-Hungary's proclamation of war against Serbia, a Russian ally. Via St Petersburg, the Russian Empire sent an ultimatum to Vienna, warning Austria-Hungary not to attack Serbia. Following the invasion of Serbia, Russia began to mobilize its very large relief army.
There was no response; hence, on the same day, Germany declared war on Russia. By its war plan, Germany ignored Russia and moved first against France by declaring war on August 3, and by transmitting its main armies through Belgium to surround Paris.
How did Russia get affected in World War I?
After assassination of the Austrian heir to the throne in June 1914, Austria-Hungary declared war on the Russia's ally Serbia, which made Russia enter WW1 in support of Serbia. During the war, Russia had some success against Austria-Hungary, but suffered significant defeats by Germany.
What was the primary reason Russia left WW1?
Russia left WW1 because it was in the interest of Russian Communists (Bolsheviks) who took power in November 1917. The Bolsheviks' priority was to win a civil war against their domestic enemies, not to fight in WW1. They also thought that Germany would soon lose the war in any case.
Why did Germany display war on Russia ww1?
The Causes of World War One
Germany declared war on Russia in support of Austria and on France because of her alliance with Russia. Britain declared war on Germany in the benefit of Belgium and France, and on Turkey because of her alliance with Germany.
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