Dewey Decimal is library classification system. It helps to locate books in the library appropriately in order to generate topics by creating library classification system. The Classification helps to organize library materials by field of study. Main divisions are philosophy, social sciences, science, technology, and history. The system is made up of ten classes, each of them divided into ten divisions and which each one has got ten sections. Using Arabic numbers, three whole numbers makes the main classes. Then following numbers make sub-classes and further divisions. The classification is hierarchical and the same hierarchy is used for the system.
 
        
                    
             
        
        
        
D and B to some extent are the same things that come with each other. 
For most, B. 
        
             
        
        
        
Answer:
When I listen to a conversation.
When I follow directions.
When I fill out an application.
Explanation:
When a girl cover her face with a book and peaks over from it then it is probable that she is listening to someones conversation which she does nor want to explicit that she has listened it. She is hiding herself in the book and pretends to be reading the book but actually she is listening someone else conversation.
 
        
             
        
        
        
I think the answer is c but I could be wrong!!