The correct option is D 1918-1921
The Civil War in Russia was a result of the emergence of opposition against the Bolsheviks. The opposition groups included monarchists, militarists, and, for a short time, foreign nations. Collectively, they were known as the Whites while the Bolsheviks were known as the Reds. The Russian Civil War tore Russia apart during a three-year period, from 1918 and 1921.