What is the first thing that people ought to do in face of pollution, according to the aut

What is the first thing that people ought to do in face of pollution, according to the author？

A．To see the sky outside in the morning.

B．To walk outside to see the colored sun.

C．To take care of, and prevent air pollution now.

D．To analyse the different layers of air pollution.

请帮忙给出正确答案和分析，谢谢！

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