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: When two pieces of metal are rubbing together and oil is added between them the friction 
 Option1: decreases 
 Option2: increases 
 Explanation: To reduce friction, oil is added to the engine.

A: decreases
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Q: Question: If Milo is measuring the energy levels of electrons and he finds that a certain electron emits more energy than another, what does that say about that electron's distance from the nucleus? 
 Option1: farther 
 Option2: closer 
 Explanation: Electrons at higher energy levels, which are farther from the nucleus, have more energy.

A:
farther
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