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: For a given medium such as air, sound has a slower speed at lower temperatures.
 Question: Mike wants his voice to travel faster, so he will speak in a room that is 
 Choices: A)colder 
B)warmer
[A]: warmer


[Q]: Paragraph: The more an elastic object is stretched or compressed, the greater its elastic potential energy is.
 Question: What will happen to the amount of elastic potential energy in Jim's rubber band if he compresses it? 
 Choices: A)more potential energy 
B)less potential energy
[A]: more potential energy


[Q]: Paragraph: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.
 Question: DJ has a solution that he removes particles from. The solution is now a _____ concentration. 
 Choices: A)higher 
B)lower
[A]:
lower