Hey there!
Option D would be correct. 
Hope this helps, tell me if I am wrong!
 
        
                    
             
        
        
        
Answer:
The cells inside our bodies are “specialized.” This means that each type of cell performs a unique and special function. For this reason, each of the 200 different types of cells in the body has a different structure, size, shape, and function, and contains different organelles.
We are multicellular organisms, different types of cells are required to do different function.
Explanation:
Actually cells in our body won't reproduce, LOL.
It get divided ( see the attached image )
 
        
                    
             
        
        
        
Answer:
 #IN GIRLS
* adolsence 
* menstruation 
#IN BOYS
* penis strts turning big
*beard starts coming of face