Answer:
 An atom's electronegativity gets higher as you move up in the periodic table. Thus, the atoms in the top right have the highest electronegativities and the atoms in the bottom left have the lowest ones.
 
        
             
        
        
        
The answer is C. To decompose death animals.
<em /><em>That's a very important thing to be done in life. Can you imagine it, all animals death without being decomposed, left there for like years and years... That would be so smelly! 
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I hope this helped you! Good luck!!
<em>~Thanks~!! <3</em>