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: In a science class, the professor demonstrates refraction to the class. First, the professor shows a curved lens from a binocular, and then a flat pane of glass, demonstrating that
Option1: the curved lens refracts less light
Option2: the flat pane refracts less light.
Explanation: The more curved the surface of a lens is, the more it refracts the light that passes through it.

A: the flat pane refracts less light.
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Q: Question: If Mona is freezing a glass of water and the temperature of the water begins to decrease, what happens to the density of that water?
Option1: increases
Option2: decreases
Explanation: Lower temperature and higher salinity yield the densest water.

A: increases
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Q: Question: Sean is trying to see how fast the water molecules are moving in a container of water. He observes that the molecules are moving very slowly, so the temperature must be
Option1: cool
Option2: warm
Explanation: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.

A:
cool
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