The actual answer (sorry for the late reply, but this is for the rest of the people coming afterwards) would actually be B) Switch primitive reptile with primitive insect. Insects came before any reptiles. 
 
        
                    
             
        
        
        
I think b surface fronts but im not 100% sure
 
        
                    
             
        
        
        
Explanation:
When yeasts eat sugar and turn it into energy, they also produce carbon dioxide. 
 
        
             
        
        
        
It has one less electrons then protons