Maybe it could be about the benefits and challenges?
        
                    
             
        
        
        
C i think Hope this helps
        
             
        
        
        
Hope this helps so 31 animals are walking towards the river right? ok so 
1 rabbit + 6 elephants then If every elephant seen 2 monkeys then 6*2 is 12.
= 19 animals.
Then another 12 animals if there is a parrot for every monkey. 
19+12 is 31 
so your awnser is 31 
 
        
                    
             
        
        
        
The answer is A. stressed unstressed stressed unstressed stressed unstressed stressed it allows you to visualize the speaker.