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).
One example: 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 is here: scarce
Explanation: Based on the information given in the paragraph, population growth will make water more scarce, so that is the correct answer.

Now, solve this: Paragraph: Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.
 Question: If Mary is cleaning her pool and she increases the pH value of the water, what happens to the acidity of the water? 
 Choices: A)increases 
B)decreases
Solution:
decreases