They were members of a wing of the Russian Social-Democratic Workers' Party who seized control of the government in Russia and then that became the dominant political power in October 1917.
Does this help at all?
I believe the answer is A) Before the Industrial Revolution, European industries relied on manual labor to produce goods, but afterward, they began relying on machines.
The Industrial Revolution was a period of time when Western Europe and the United States began to transition to using machines instead of manual labor. Lots of new inventions were thought of during this time period.
Hope this helps! Please let me know if I'm wrong :)
It was to rebuild the South after the Civil War