According to Darwin, why do people laugh？A．Laugh is a survival technique for babies.B．They

According to Darwin, why do people laugh？

A．Laugh is a survival technique for babies.

B．They laugh to ease hostilities.

C．They laugh to make parents feel relaxed.

D．They laugh to fight off disease.

请帮忙给出正确答案和分析，谢谢！

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