The soft sound is the low pitch sound and can be produced with the slow vibrations.
The sound is given as the travelling of the vibration with air. The transmission of the vibrations can be given as the waves.
The speed of the transmission of the vibrations produces the high and the low note that are considered as the hard and the soft sounds.
The soft sounds are the low vibration sounds. Thus, the low vibrations are the example of the soft sound. Hence, option C is correct.
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