`{:(,"Column A",,, "Column B"),(A., "Amplitude", (), a., "Vocal cords"),(B., "Frequency", ( ), b., "Sound absorbing material."),(C., "Human beings", ( ), c., "Reciprocal of time period"),(D., "Carpets", ( ), d., "m"):}`

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Correct Answer - A : d B : c C : a D : b

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