To find:
The unit of the intensity or loudness of the sound.
Step-by-step explanation:
The Decibel is used to measure the loudness level or intensity of the sound. The symbol of the decibel is dB.
The Herts is the SI unit of frequency. The Hertz is equivalent to the inverse of seconds.
The symbol of the Hertz is Hz.
The meter is the SI unit of the length of distance. The symbol of the meter is m. The other units of length are kilometers, feet, and miles
The meter/second is the SI unit of the speed and velocity. The symbol of this unit is m/s.
Final answer:
Thus the correct answer is option A, Decibels.