Final answer:
The trachea divides into two tubes known as bronchi, which are the airways that lead to the lungs and further branch into smaller bronchioles ending in alveoli for gas exchange.
Step-by-step explanation:
In order to carry air to both lungs, the trachea branches into two tubes called bronchi. The trachea is a long tube that leads down to the chest and bifurcates into the right and left bronchi as it enters the lungs. These bronchi branch further into secondary and tertiary bronchi, and eventually into smaller tubules called bronchioles. The bronchioles then terminate in clusters of air sacs known as alveoli, where gas exchange occurs between the air and the blood.
The correct answer to the student's question is: A) Bronchus.