You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: A piece of sandpaper was rubbed across a glass table, then the sandpaper was rubbed across some gravel. The friction will be greater between 
 Option1: the sandpaper and the glass table or 
 Option2: the sandpaper and the gravel. 
 Explanation: Rougher surfaces have more friction between them than smoother surfaces.

A: the sandpaper and the gravel.
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Q: Question: Ron was playing with a flashlight. He moved it back and forth slowly, and then quickly. Which motion likely caused less light to bend? 
 Option1: the slow motion 
 Option2: the quick motion 
 Explanation: In refraction of light, the greater the change in speed, the more light bends.

A: the slow motion
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Q: Question: If Jim turns the thermostat up in his room while listening to music, what will happen to the speed of the sound waves in the room? 
 Option1: they will speed up 
 Option2: they will slow down 
 Explanation: For a given medium, sound has a slower speed at lower temperatures.

A:
they will speed up
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