What was the most significant consequence of the Russian Revolution of 1917?

AThe Bolsheviks under Lenin seized power and instituted a Communist government that lasted more than seventy years.
BStalin and the Mensheviks drove the czar from power and set up a moderate provisional government that lasted only a short time.
CKerensky and the Red Army took control of the government and set up a dictatorship that created famine throughout the country.
DThe supporters of Czar Nicholas ...

Verified Answer :

It could be argued that the most significant consequence of the Russian Revolution of 1917 was that "A. The Bolsheviks under Lenin seized power and instituted a Communist government that lasted more than seventy years," since this was ultimately the basis for the Cold War that existed between the USSR and the US.