The correct outcome of the Russian Revolution among the options provided is: The Bolsheviks seized power.
The Russian Revolution, particularly the October Revolution in 1917, led to the Bolsheviks, a faction of the Marxist Russian Social Democratic Labour Party, taking control of the government. The other options are not accurate outcomes of the revolution: the czar did not regain the throne, Russia did not develop a democracy in the way many might expect, and the dictatorship ultimately established by the Bolsheviks was a form of authoritarian rule that replaced the previous autocratic regime.