Respuesta :
The correct answer is C) the existence of sharp economic differences between social classes.
A major cause of the Russian Revolution of 1917 was the existence of sharp economic differences between social classes.
People could no longer stand the poor situation in which they lived and they had to start the revolution against the Tzar, The working class and the Russian peasants started the rebellion against Tzar Nicholas II, led by the Bolsheviks with Vladimir Lennin at the front. The Bolsheviks defeated the Melshevicks, creating the Soviet Union.