题目内容
（请给出正确答案）
From what Warneken said in the passage, we can infer that ______.
A．no other nonhuman primate can be as altruistic as chimpanzees
B．altruism has never been observed in any nonhuman animals before
C．chimpanzees did not display altruism in their previous experiments
D．it is the first time they have conducted experiments about chimpanzees
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