Pls ans fasttt

Solution:

The correct option is (a).
Not all respiratory organs are located deep inside the body. Functionally, respiratory organs are divided into conducting zone and respiratory zone. 

• Conducting zone consist of nose, pharynx, larynx, trachea, bronchi. These structures help in causing air to move in and out as they form a passage.
• Respiratory zone is located deep inside the body in lungs. It contains bronchioles, alveolar ducts and alveoli.