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The 1918 Treaty of Brest-Litovsk altered the course of World War I by

ensuring the Allies' victory over the Central Powers.

ending Russia's involvement in the conflict.

consolidating Russia and German power in the region.

assuring the United States would join the conflict.

the answer is b

The 1918 Treaty of Brest-Litovsk altered the course of World War I by ending Russia's involvement in the conflict.

Explanation:

On 3 March 1918 The Brest - Litovsk treaty was signed putting an end to Russia's participation in the war which is a peace treaty. It was signed between Russia and the combined powers of Germany, ottoman empire, Bulgaria and Austria - Hungary.

The October Revolution, Russia' s endless loss and the outbreak of civil war compelled Russia to withdraw from the First World War.