Disregarded. The answer is D.
 
        
             
        
        
        
The correct answer is "of the children". This adjectival phrase is used to modify and further explain the noun "voices".
        
             
        
        
        
 What country are you taking about
        
             
        
        
        
Answer:
Yes, they should.
Explanation:
It teaches students the importance of helping others, even if you don't expect something in return.