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).

[EX Q]: Paragraph: More pollutants mean poorer air quality.
 Question: Michael is studying the air quality of various cities. He finds that there are many more pollutants in the air in Mexico City, than there are in the air of Chicago. Therefore, the air quality will be higher in 
 Choices: A)Chicago 
B)Mexico City
[EX A]: Chicago

[EX Q]: Paragraph: The more extreme the amount of metamorphism, the more difficult it is to tell what the original rock was.
 Question: Jeff put a rock under very minimal metamorphosis. The rock probably _____ its original form. 
 Choices: A)resembles 
B)does not resemble
[EX A]: resembles

[EX Q]: Paragraph: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.
 Question: If Mona fills up a cup with water and places that water into the oven, what happens to the density of the water as it heats up? 
 Choices: A)increases 
B)decreases
[EX A]:
decreases