Respuesta :
Answer : A. It decreases and then increases.
Explanation : Troposphere is the lowermost layer of atmosphere.
Stratosphere is next layer up to the troposphere. As the jet descends from stratosphere towards the troposphere, the temperature initially decreases and then at troposphere is roughly constant and then steadily increases.
So, option (A) is correct.

Answer:
The answer is not A It decreases and then increases. The correct answer is C It increases steadily.
Explanation: I just got the answer wrong by going with It decreases and then increases.