单选题：Why does Aaron Gellman think air travel is　still the safest

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题目内容：
Why does Aaron Gellman think air travel is　still the safest mode oftransportation by far A．There have been hardly any incident resulting from unprofessionalbehavior.
B．Cases like the JetBlue incident arer are.
C．Pilots always emphasize the safety of the public.
D．The first officer is always there to help the captain.

参考答案：
答案解析：

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