The Socialist Revolution in Russia took place in 1917.

Background
- In 1914, Russia had entered World War I on the side of the Allies.
- The war brought about economic hardship, food shortages, and military casualties.
- These issues led to discontent among the Russian people and created an environment ripe for revolution.

February Revolution
- In February 1917, a series of protests and strikes broke out in Petrograd (now St. Petersburg), the capital of Russia.
- The protests were mainly led by workers and soldiers who were demanding better working conditions, higher wages, and an end to the war.
- The protests quickly spread throughout the city and eventually led to the overthrow of Tsar Nicholas II, who had been ruling Russia since 1894.

Provisional Government
- Following the Tsar's abdication, a Provisional Government was established to rule Russia until a new government could be formed.
- However, the Provisional Government was weak and ineffective, and it failed to address the main concerns of the Russian people.

October Revolution
- In October 1917, the Bolshevik Party, led by Vladimir Lenin, seized power from the Provisional Government in a coup d'état known as the October Revolution.
- The Bolsheviks established a new government based on Marxist principles, which became known as the Soviet Union.
- The October Revolution marked the beginning of the socialist revolution in Russia and led to significant changes in the country's political, social, and economic structures.

Conclusion
The Socialist Revolution in Russia took place in 1917, following a period of discontent and unrest among the Russian people. The February Revolution led to the overthrow of Tsar Nicholas II and the establishment of a weak Provisional Government. The October Revolution, led by the Bolshevik Party, marked the beginning of a new era in Russian history and the establishment of the Soviet Union.

Socialist revolution took place in 1917 in Russia that's why option b is right.