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: Air in the troposphere is warmer closer to Earths surface.
 Question: Micah is leaving the atmosphere, leaving in a rocket from the Earth's surface.As he's passing through the troposphere, the air is going to get 
 Choices: A)warmer 
B)colder
colder