The correct answer is B. They would go into small spaces of the machines in factories that adults could not reach.
Explanation
During the time of industrialization, the factories of the urban centers were very important because there was concentrated the greatest producing force of the countries. At this time, most companies employed children to work because their salary was less than that of adult men, and because of their size, they could enter the smaller compartments of the machines. So, the correct answer is B. They would go into small spaces of the machines in factories that adults could not reach.
Due to the fact of INDUSTRIALIZATION period, families used to have small businesses, family crops or kind of cows, pork and some agriculture. But in the urban spaces like small stores or small negotiations was very helpful to have children around the adults to see them working, sharing knowledge and learn from them to continue the family tradition in the future.
