An effect of the Russian Revolution on World War I is that Serbian nationalists formed an alliance with the Ottoman. Option C is correct.
World War I was a global war that took place in Europe that spanned from 28 July 1914 to 11 November 1918. Contemporaneously considered as "the war to end all wars", it led to the mobilisation of more than 70 million military personnel, including 60 million Europeans, making it one of the largest wars of all times.
