(D) The $larynx$ is a cartilaginous box which helps in sound production and is hence called the sound box.During swallowing,glottis can be covered by

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(D) The $larynx$ is a cartilaginous box which helps in sound production and is hence called the sound box.During swallowing,glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx.Vocal cords are present in the larynx,which vibrate to produce sound.