Russia became a when the bolsheviks forced czar nicholas the ii out.
a. republic
b. monarchy
c. socialist country
d. none of the above

The best answer is c. Socialist Country: The Bolsheviks were a part of the communist party in Russia.

however, Russia was also a Rebublic for 8 months after the Tsars were pushed out (but the introduction of Bolsheviks means that c is a better option).

Advances in learning and technology made long ocean voyages possible