Which area of the respiratory system is where gaseous exchange occurs?

Alveoli

The correct answer is Option (3) - Alveoli

Alveoli are tiny, balloon-shaped air sacs in your lungs.

The function of the alveoli is to move oxygen and carbon dioxide (CO2) molecules into and out of your bloodstream.

Alveoli are an important part of your respiratory system, which includes the parts of your body that help you breathe.