Adverbial clause because adverbial clauses modify verb,adverb and adjective by telling how,where,why,when 
        
             
        
        
        
I would say D. Because authors always try and make their characters have a strong and unique voice to make their writing piece more comforting or relatable
        
             
        
        
        
Some people might say it is even good to mention incomplete projects, It's even better to have something already done. I would say that it would be fine to mention it, might even help.
        
             
        
        
        
5+x
x represents the number, and "more than" indicates that it's addition.