Answer:
D 
Explanation:
it explains in great detail what the propose of dopamine's is and what they do. so this would be the most logical. at least this is what I think. I'm no teacher lol. good luck 
 
        
             
        
        
        
I think the answer is Special Power of Attorney, it is an authority given to another person of the accountable person (principal) to act on behalf his absence for a transaction. At times this happens when a someone gets too busy of attending to every task.
        
             
        
        
        
Is talking would be your answer