Answer:
B. They would go into small spaces of the machines in factories that adults could not reach.
Explanation:
During the Industrial Revolution, child labor became more and more common. Big industries and factories often employed children because they were paid less than adults. The textile industry was one of the biggest ones that relied on a certain amount of child labor. Children would carry out many kinds of tasks that often included things like going into small spaces where adults couldn't reach or fit.