Answer:
The correct answer is: Russia withdrew from the war.
Explanation:
In March 1917, Russian tsar Nikolai II abdicated and the state appointed the Provisional National government. This event caused confusion and chaos between the citizens and the army became inefficient. The popularity of the Bolsheviks, led by Vladimir Lenin, increased.
In 1918, Lenin signed the Treaty of Brest-Litovsk, so Russia was expelled from the war and surrendered some of its territories to Central Powers.
