The error in the possessive construction is that, instead of passenger's, it should be "passengers'". The apostrophe should be after the letter "s" because the noun is in the plural form. The correct sentence would be "Passengers' concerns about cell phone use on planes are justified."
        
             
        
        
        
D. Is correct. The thesis statement is what your entire essay/paper will be about!
        
                    
             
        
        
        
The schoolhouse reveals that the story takes place in the distant past because it is the only one for all the island's students
Hope this helps!
        
                    
             
        
        
        
Based on the NPR series of the same name, This I Believe features 80 Americans--from the famous to the unknown--completing the thought that begins with the book's title. The pieces that make up the program compel listeners to re-think not only what and how they have arrived at their own personal beliefs,