High- and low-pressure areas leading to air movement happen when there are differences in:

a.
density

b.
clouds

c.
precipitation

d.
atmosphere

I think the correct answer from the choices listed above is option A. High- and low-pressure areas leading to air movement happen when there are differences in density. Higher density means higher pressures and lower density means lower pressure. Hope this answers the question.

Sorry i don’t know what to do

Ibelieve the answer is b