I WILL GOVE BRAINILEST THIS IS CONFUSING

What factor helped the Bolshevik Communists gain power in Russia?
A
The United States supported the goals of the Bolsheviks and provided them with money and weapons.
B
The Russian Republic surrendered in World War I but the people of Russia wanted to continue the fight.
C
The Russian people were suffering because of World War I and wanted to end the war.
D
The tsar supported the Bolsheviks and the Russian people followed the will of the tsar.