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: 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
decreases