How are lungs designed in human beings to maximize the area of exchange of gases?

Concept: Each lung has an exceedingly branched respiratory tract called a respiratory tree. An essential bronchus separates into auxiliary bronchi, auxiliary into segmental bronchi, and segmental bronchus into bronchioles which divides into terminal bronchioles, respiratory bronchioles, alveolar sacs, and alveoli. Alveoli are little adjusted pockets that are amazingly lean-walled and have an organized capillary over their surface. They work as respiratory surfaces. To add-up the zone of all the alveoli is more than 80m². It is a few times more than the surface of the entire human body.

Hence, the correct answer is option C.