Read the paragraph from the section "Portable Habitat." *Divers' bodies need to adjust to the changing water pressures from the deep ocean to the sunny surface. Usually,
this means divers "hang out" at different stops on a "shot line" descending from the surface.*
Why did the author include this paragraph in the article?

a to illustrate the reason Lombardi invented a portable habitat
b to introduce the idea that diving can be a dangerous job
c to emphasize the effects of water pressure on divers
d to elaborate on activities divers enjoy doing while underwater