How thd NASAs investigators prove the reason of thsaster？A．By studying the video tape.B．By

How thd NASAs investigators prove the reason of thsaster？

A．By studying the video tape.

B．By analyzing the data concerned.

C．By anatomizing seven astronauts" body.

D．By making a simulated experiment.

请帮忙给出正确答案和分析，谢谢！

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