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Cindy leI think (A) is wrong but i'm not sure about itAnd what is the hint in Philip's question that led you to that conclusion?
Cindy le I just think that (A) is wrong in grammar.What is wrong about it? How would you correct it?
Cindy leOne of the most distinctive features of humans isIf your concern is the use of is with humans, that isn't the mistake. Is is the proper verb form to go with the subject one (of the most distinctive features...). Can you see something wrong with answer (C)? Remember: not all mistakes concern grammar.