Air pressure is highest in the lungs during which of the following points?

select one:
a. beginning of inspiration, when lung volume is lowest
b. beginning of expiration, when lung volume is lowest

I know the answer is not at the end of inspiration when lung volume is lowest so, it must be at the beginning of expiration, when lung volume is lowest. However, when I looked up expiration and inhaltion, it made it seem like inspiration was the answer...

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"