Given the task definition and input, reply with output. You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: In the thermosphere, temperatures increase as altitude increases.
 Question: If Mona is flying her plane in the thermosphere and she moves to a lower altitude heading, what happens to the temperature? 
 Choices: A)increases 
B)decreases
decreases