The correct answer is: A. Pharynx
The pharynx is a muscular tube that connects the mouth and nose to the esophagus and larynx. It is located at the back of the throat and is responsible for both swallowing and breathing.
When you swallow, food passes down the pharynx and into the esophagus. The epiglottis, a flap of cartilage, closes off the larynx to prevent food from entering the lungs.
When you breathe, air passes through the pharynx and into the larynx. The vocal cords, located in the larynx, vibrate to produce sound.
The trachea, bronchi, and alveoli are all part of the respiratory system. The trachea is a tube that connects the larynx to the bronchi. The bronchi are two tubes that branch off from the trachea and lead to the lungs. The alveoli are tiny air sacs in the lungs where gas exchange takes place.
I hope this helps!