Answer:
D. the warm air rises and moves back to the poles where it is cooled again.
Explanation:
One way to know that D is your answer is that hot air always rises.
That means 1 and 3 are not it.
It is not 2 because it will not just go back up into the atmosphere but go back towards the pole.
When it goes back towards the pole, that means D is your answer.
