The correct answer is C. Sound.
A decibel (dB) is a logarithmic unit that expresses the ratio of a physical quantity (such as sound pressure, power, voltage, etc.) to a reference value. It is often used to express the intensity of sound, with 0 dB being the threshold of human hearing.
Air, water, and soil are all mediums through which sound can travel. However, the decibel scale is not specific to any one medium. It can be used to measure the intensity of sound in any medium.
The decibel scale is a logarithmic scale, which means that each increase of 10 dB represents a tenfold increase in intensity. For example, a sound that is 10 dB louder than another sound is twice as intense.
The decibel scale is also a relative scale, which means that it does not have an absolute zero. This means that there is
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