I'm pretty sure it's A. some
        
             
        
        
        
Answer:
Genetics affect almost everything about you. 
Explanation:
Hi there, 
Genetics influences what sort of traits you will inherit from your parents, regardless of good or bad traits. For example, your appearance can be similar to other family members since your genetics is derived from your parents and older relatives. Genetics also influence other things about you such as the diseases you may have or your life expectancy. While genetics influences the physical aspects about you, it does not have direct influence over who you are as a person. 
Hope this answer gives you a good idea about genetics. Feel free to follow up with some questions.
 Cheers.
 
        
             
        
        
        
Incorporate what? if you mean their selfs then i would say by giving a spice of them self or make their story have some character that relates to them, but then again the story itself is them already.
        
             
        
        
        
Thinking about Grendel, I think 'A' is most likely.
        
                    
             
        
        
        
Carelessly/ careless / carelessness