Answer:
D It shares the main idea of an essay and introduces reasons to support the topic.
Explanation:
The controlling idea in an informative essay is the opinion of an author about the given topic. It also talks about how the story will be developed and explain the reason for writing the sentence or article. 
Therefore, the purpose of a controlling idea in an informative essay is to share the main idea of an essay and introduces reasons to support the topic.
 
        
             
        
        
        
i believe its A. Theres the phrase "i cant stress this enough" or something along those lines and my perants usually say that when theyve sad some thing alot or loudly. 
 
        
                    
             
        
        
        
bear maybe like i bear a child this is misspelled  
 
        
                    
             
        
        
        
Which book is it? that way i can answer your question
        
             
        
        
        
D- serves as a turning point.