What prevents food from entering the windpipe?

The correct answer is: A. Epiglottis

The epiglottis is a flap of cartilage that covers the opening to the windpipe (trachea) during swallowing. This prevents food from entering the windpipe and causing choking.

The pharynx is the muscular tube that connects the mouth and nose to the esophagus and larynx. It is responsible for swallowing and speaking.

The trachea is the tube that carries air from the larynx to the lungs. It is lined with mucus and cilia, which help to trap dust and other particles.

The larynx is the voice box. It contains the vocal cords, which vibrate to produce sound.

I hope this helps!