Respuesta :
A political pressure from Great Britain and France was the contributory factor to Russia involvement in WWI after the Russian Revolution of 1917.
What was Russia involvement in WWI?
The country was drawn into the war by the alliance system because its promises support to Serbia and its Balkan allies/
However, the political pressure from Great Britain and France was also the contributory factor to Russia involvement.
Therefore, the Option C is correct.
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