Question

in october 1917, there was a revolution in russia. what happened just a couple months after the russian revolution?
tsar nicholas ii of russia came back into power.
russia dropped out of world war i.
the allied powers declared war on russia.
russia decided to ally with germany.

Explanation:

The October 1917 Russian Revolution brought the Bolsheviks to power. In March 1918 (a couple months later), Russia signed the Treaty of Brest-Litovsk, ending its participation in World War I. Tsar Nicholas II had abdicated in March 1917 (before the October Revolution) and did not return to power. The Allies did not declare war on Russia immediately after the revolution, and Russia signed a separate peace with Germany, not an alliance.

Answer:

Russia dropped out of World War I.