Answer:
the 4th one The lumen, is my guess 
 
        
                    
             
        
        
        
They are composed of proteins. I cannot see the options but hopefully that answer is in one of them
        
             
        
        
        
The fourth one that looks like an M. This is because it describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups.