C. Illustrate
If I am not mistaken!
Hope this helps you!
        
             
        
        
        
A a sign or character used to represent a tone
        
             
        
        
        
Best of all, are the days we go horseback riding
        
             
        
        
        
Group of stars.
An appositive or appositive phrase renames a noun or pronoun that is right beside, specifically after, it. It is usually used to provide additional information, like a definition or clarification. In this sentence, "group of stars" is defining "constellations" making it the appositive phrase.
        
                    
             
        
        
        
D. when it tries to sell you products related to your obvious interests