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: Greater use of oil and other fossil fuels causes more pollution.
 Question: Mona lives in a city that uses much oil. If the mayor of that city decides to change their policy and the city begins using less oil, what happens to the amount of pollution generated by the city? 
 Choices: A)increases 
B)decreases
Solution:
decreases