I think it’s A. 907-960 CE
Answer: I believe the Answer is B-- The place where most people in ancient china lived.
Explanation:
Ancient Chinese civilization began along the Huang He river, or "yellow river". I don't know how they were with farming, but because that's where their civilization began, I'd imagine that that's where most people in ancient China lived.
The problem centered around factories that used a new based technoloy.
Andrew carniege installed a lot of new inventions in order to increase the efficiency of his production. This ended up making a lot of skilled workers to lose their jobs/position in the industry and replaced with low skilled worker to operate the machinary.