Answer:
D
Explanation:
Air at both poles sinks because it is more dense, it then flows back towards the equator where it is warmer and the air becomes less dense and rises. It’s called convection current.
ETA: I just took this quiz and got the answer I chose right, just didn’t want others coming here for help to get it wrong due to the first person saying the answer was A, which is the exact opposite of what happens.
