(C) The correct answer is $C$. $Vocal$ $cords$ are two pairs of folds of mucous membrane that extend into the lumen from the sides of the larynx. Thes

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(C) The correct answer is $C$. $Vocal$ $cords$ are two pairs of folds of mucous membrane that extend into the lumen from the sides of the larynx. These cords vibrate when air passes through them,which is responsible for the production of sound during respiration.