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: If Milo is flying through the air and he moves farther from the Earth, what happens to the temperature of the air? 
 Option1: increases 
 Option2: decreases 
 Explanation: Air in the troposphere is warmer closer to Earths surface.

A: decreases
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Q: Question: Would a star that is significantly cooler than the sun, which is outputting blue light which is higher in frequency that the yellow light of the Sun, be 
 Option1: hotter 
 Option2: colder? 
 Explanation: Shorter wavelengths (higher frequencies) correspond to higher energies and thus hotter star temperatures.

A: colder?
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Q: Question: If you mixed salt water and regular water which would float? 
 Option1: regular water 
 Option2: salt water 
 Explanation: Water density increases as salinity and pressure increase, or as temperature decreases.

A:
regular water
****