Sonar is a device for:

Location and ranging of aircrafts

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Location and ranging of submarines

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Producing a musical note of high quality

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Measuring frequency of musical notes

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Solution

The correct option is B Location and ranging of submarines
SONAR (sound navigation and ranging) is a device based on the principle of reflection of sound, an ultrasonic wave is transmitted from a Sonar towards the bottom of the sea, the wave comes back after reflection from the object (maybe a submarine), we record the total time of travelling of ultrasonic wave, now by the speed of wave and time we can detect the location of submarines.

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