How did the russian revolution impact world war i? ?

Russia withdrew from the war weakening the Allied powers and allowing the Central Powers to focus on one front. It added to the US entering the conflict.

Explanation:

The Russian Revolution meant an end to the Eastern Front:

The defeated Empire lost much of its territory (almost thirty percent of its former dimensions) to the Germans.

A revolution made the Bolsheviks conclude in 1918 terms for the peace with signing the Treaty of Litovsk. The southern part of Russia was taken by the Ottomans, by doing so, almost a third of its former territory was lost.

This caused troops were reassigned to the Western Front, where the major offensive had reached a stagnation.

The Germans were unable to reach Paris, had more manpower but the later entry of the US to defend its allies eventually turned the odds in favor of the allies.

Us entry to the war made the US become the superpower, replacing the role England had in the European and world stage.

i believe your answer is d)