What is the main topic of this news？A．How to ensure safe navigation at night.B．The possibl

What is the main topic of this news？

A．How to ensure safe navigation at night.

B．The possible reasons for greenhouse effect and the solutions.

C．How to use the Sun"s rays to help flights.

D．Negative effects of the nighttime flight on the environment.

请帮忙给出正确答案和分析，谢谢！

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