The correct answer is B. Ending Russia's involvement in the conflict.
Explanation
The Brest-Litovsk treaty was the treaty that marked Russia's exit from the First World War in 1918. In addition, it established the territorial concessions that Russia would grant to the central powers. Most of the countries granted by Russia were from Eastern Europe such as Poland, Estonia, Lithuania, Ukraine, among others. According to the above, the correct answer is B. Ending Russia's involvement in the conflict.
