a) Treaty of Brest-Litovsk
b) Establishment of a constitutional monarchy
c) Abdication of Tsar Nicholas II
d) Rise to power of the Bolshevik Party
The correct answer is b) Establishment of a constitutional monarchy.
The Russian Revolution in 1917 was a pivotal moment in history that led to the overthrow of the Romanov dynasty and the establishment of the Bolshevik Party, led by Vladimir Lenin. The revolution had several significant effects, but it did not result in the establishment of a constitutional monarchy. Instead, it resulted in the formation of a socialist state, known as the Soviet Union.