You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.
 Question: John's town used to have lots of water, back when there were only a few hundred people. However, now that the town holds several thousand people, the water availability is 
 Choices: A)scarce 
B)plentiful
Solution: scarce
Why? Based on the information given in the paragraph, population growth will make water more scarce, so that is the correct answer.

New input: Paragraph: Air in the troposphere is warmer closer to Earths surface.
 Question: As the rocket falls down through the troposphere and gets nearer to the Earth's surface, the air will be 
 Choices: A)warmer 
B)cooler
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
warmer