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: With less ozone in the stratosphere, more UV rays reach the ground.
 Question: Carlos knows that there is less ozone in the stratosphere, and goes out on a sunny day. He puts on sunscreen knowing that the UV rays can reach the ground 
 Choices: A)less 
B)more
[EX A]: more

[EX Q]: Paragraph: More water allows more chemical reactions.
 Question: Timmy tested his chemicals by subtracting water and noticed _____ reactions. 
 Choices: A)more 
B)less
[EX A]: less

[EX Q]: Paragraph: If we have two materials with the same volume, the material with a higher mass will be more dense.
 Question: If there are two equal-volume objects, the least dense object will be the one with _____ mass. 
 Choices: A)higher 
B)lower
[EX A]:
lower