Air pressure is when lung volume a. highest; highest b. lowest; highest c. lowest; constant d. constant; highest

The correct answer would be option B. lowest; highest.

Explanation:

Inspiration is the process of inhaling oxygen and air into the lungs. During inhalation, the contraction of the diaphragm and the volume of lung increases in volume, this leads to decreasing in the intraalveolar air pressure so that air flows into the lungs.

Exhalation is the process of releasing air out of the lungs while breathing. During expiration, the relaxation of the diaphragm decreases the lung volume and increases the intraalveolar pressure.

Thus, the correct answer is option B.