B. Segregation. 
I have the same question and answered it and this is what it told me. I think it should be right. 
        
             
        
        
        
The only mutations<span> that matter to large-scale evolution are those that can be </span>passed on<span> to </span>offspring<span>. These occur in reproductive cells like eggs and sperm and are called germ line </span>mutations<span>. A single germ line </span>mutation<span> can have a range of effects: No change occurs in phenotype.</span>
        
                    
             
        
        
        
The radius of the circle would be 7.42in