Answer:
The correct answer is c. It enables the rapid transfer of electrons, thereby increasing the efficiency of proton pumping.
Explanation:
Having three complexes will increase efficiency due to the fact that these complexes are connected, being more efficient in proton pumping. 
 
        
             
        
        
        
The answer to your question is c 
hope this helped
        
             
        
        
        
Answer:
C. The population will have more possible adaptations.
Explanation:
The adaptations will allow the populations to adapt to the environment better increasing their survival chances.