Diffusion moves air molecules from an area of ​​high pressure to an area of ​​low pressure. Which of the following conditions would most likely cause air to move from outside of the body and into the lungs?
a. a low level of air pressure in the alveoli and a high level of air pressure in the lungs
b. a high level of air pressure in the alveoli and a low level of air pressure in the lungs
c. a low level of air pressure in the lungs and a high level of air pressure in the environment
d. a high level of air pressure in the lung and a low level of air pressure in the environment