How did NASAs investigators prove the reason of disaster？A．By studying the video tape.B．By

How did NASAs investigators prove the reason of disaster？

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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