Children used to work in factories due to child labor. The men would be off fighting in wars and the women would work at factories or stayed at home. With children they didn't have to get paid because of their age and were treated badly. That is why they were chosen to start working in factories.
Answer:
B. A PEACEFUL LABOR RALLY ENDED WITH A BOMB EXPLODING
Farmboys, shopkeepers, artisans, urban workers
The movable type printing press.
