An Observer Perceives a Sound to Be Lower in Frequency

An observer perceives a sound to be lower in frequency when the sound source is moving away from the observer.  This shift in the frequency of the perceived sound occurs because:

A) the sound waveform velocity decreases as the distance between source and observer increases.
B) sound waveforms are reflected off environmental objects nearby.
C) successive sound waveforms are emitted further away from the observer.
D) the sound wave intensity decreases as the distance between source and observer increases.

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