Since both the state and victim have achieved appropriate retribution, the act can be considered justified revenge
        
             
        
        
        
the choice and use of words and phrases in speech or writing
 
        
             
        
        
        
Answer:
They must be at least 7 years
 
        
                    
             
        
        
        
Though I can't see all the answers here's my take:
The author was making a point that Voltaire's humor was not welcomed because it criticised their beliefs and the book was banned because it was full of his criticising humor that they did not appreciate.