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B
above 20 kHz
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C
between 20 - 2000 Hz
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D
between 2000 - 20 kHz
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Solution
The correct option is A below 20 Hz Infrasound refers to sound having frequency lesser than the lower audible limit of human hearing. It has frequency below 20 Hz. Animals like giraffe, elephant and pigeons are capable of hearing infrasound.