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: 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: A thinner wire is more difficult for electrons to move through than a thicker wire.
 Question: If you use a thin piece of wire then electrons move 
 Choices: A)easier 
B)harder
[A]: harder


[Q]: Paragraph: If two objects have the same mass, the object with the higher temperature has greater thermal energy.
 Question: If you were to heat up steel what would happen to its thermal energy? 
 Choices: A)increase 
B)decrease
[A]:
increase