it was the main cause because the lower class were being forced into the military, which drove those who weren't in the army, to have a problem with it
Csar Nicholas II refusal to withdraw from World War I, is the right answer.
The Russian Revolution was a series of revolutions took place in Russia in the year 1917. Csar Nicholas II refusal to withdraw from World War I led the Revolutions to take place in Russia. For instance, the defeat of the Russian Army in the years between 1914 and 1916 made them fled from the battlefield. Therefore, in order to obstruct the path of the enemy, the Russian army devastated the crops and structures which directed to over 3 million refugees in Russia. Moreover, Russia's call for able-bodied men in the war resulted in labor shortage and shutting down of various workshops. A large amount of crop was sent to feed the army. This situation in the long term created a scarcity of bread and flour for people living in the cities.
In this way, the refusal of Csar Nicholas II led to the Russian Revolution.
