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: Its harder to overcome friction between heavier objects and the floor than it is between lighter objects and the floor.
 Question: Fred was moving a desk across the room. He then pushed a chair and it was much easier. This is because the lighter chair had _____ friction with the floor. 
 Choices: A)less 
B)more
[EX A]: less

[EX Q]: Paragraph: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.
 Question: Penny added salt to her cup of water and noticed the water got _____. 
 Choices: A)thicker 
B)thinner
[EX A]: thicker

[EX Q]: Paragraph: With a higher the concentration of hydrogen ions, a solution is more acidic and has a lower pH.
 Question: If Jim wants to lower the pH of his solution he should do what to the concentration of hydrogen ions inside of it? 
 Choices: A)decrease 
B)increase
[EX A]:
increase