Perhaps D? It could depend on the context of the story though.  I hope this helped, good luck! :)
        
             
        
        
        
Dear Dad,
When are you bringing the milk back from the store, its been twenty two years?
Love,
Son
 
        
             
        
        
        
Increase listener comprehension and help reinforce key concepts
 
        
                    
             
        
        
        
The correct answer is B. They would go into small spaces of the machines in factories that adults could not reach. 
Explanation:
During the period of industrialization from the 18th century to the 19th-century child labor was common as more workers were required and also families struggle to get enough money. Indeed, during this time it was common children as young as four or five years old worked in factories and mines where they would go into machines or other places adults could not reach or would do tasks that require small hands. Additionally, children were paid less, did not attend school and worked in hazardous and difficult conditions which often led to accidents or injuries. Thus, the statement that describes the common role of working children during industrialization is "They would go into small spaces of the machines in factories that adults could not reach".