Answer:
to lend credibility to the claim that other species also use tools 
Explanation: it makes more sense than all the other options B to show chimpanzees are not intelligent disproves her first point at the start of the story especially when she said accept as human because humans are the smartest animals there is and let us be honest C is just obviously wrong.
 
        
                    
             
        
        
        
I believe the answer is "<span>They did not want to appear divided in front of their armies."</span>
        
             
        
        
        
I believe it is reveal the structers ( sorry about the spelling)
        
                    
             
        
        
        
Because the similarities are not the same as the different