According to the passage which of the following s

According to the passage,which of the following statements is NOT true about the UFO investigation by the US Air Force?

A.Approximately 94 percent of the UFO reports received were explained.

B.UFOs were once regarded as a potential danger to national safety.

C.The investigation showed that America will not be threatened by the reported UFOs.

D.The investigation proved that further UFO research would be of great value.

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