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 ii were able to defeat the communist rebels and instituted even more repressive policies against the people.?