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).

[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: When we raise the temperature of water it becomes 
 Choices: A)less dense 
B)more dense
[A]: less dense


[Q]: Paragraph: For a given medium such as air, sound has a slower speed at lower temperatures.
 Question: If Mary is blowing an air horn underwater and she lowers the temperature of the water, what will happen to the speed of the sound waves generated by the air horn? 
 Choices: A)increase 
B)decrease
[A]: decrease


[Q]: Paragraph: Larger telescopes can collect more light and see finer details than smaller telescopes.
 Question: Mona is trying to build a telescope that can collect more light then her current one. If she wants to make sure to achieve this goal, what should she do to the size of her telescope? 
 Choices: A)decrease it 
B)increase it
[A]:
increase it