Final answer:
The upper section of the respiratory system includes the nasal cavity and pharynx, with option c) being the correct answer. The larynx is also part of the upper respiratory system that conducts air, moistens, warms, and filters it.
Step-by-step explanation:
The upper section of the respiratory system includes the nasal cavity, pharynx, and larynx. These components are involved in the conduction or movement of air into and out of the body. They also play a key role in filtering, humidifying, and warming the air that we breathe. So, the correct answer to the question 'What does the upper section of the respiratory system include?' is c) Nasal cavity and pharynx.
The lower respiratory tract, in contrast, includes structures like the trachea, bronchi, and alveoli that are mostly involved in the exchange of gases. The diaphragm and intercostal muscles are also vital as they facilitate the process of breathing but are not part of the upper respiratory system.