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.
Her and me is wrong it could be replaced with we us etc.
It has to be A since it's the only one that describes both the financial effects and emotional effects because of the inappropriate words.
