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This passage discusses the Doppler effect, describing how sound waves change pitch as a source (such as a locomotive or ambulance) approaches and then passes an observer. Which statement is NOT listed as a detail in the passage?

A.The oncoming sound waves have a higher pitch because of high frequency and closeness of the waves.B.The oncoming sound waves have a higher pitch because of low frequency and closeness of the waves.C.The whistling sound of the locomotive as it approaches and passes can be explained by the Doppler effect.D.The high-pitched sound of the ambulance as it approaches and passes can be explained by the Doppler effect.

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