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: When in the stratosphere, Dean can tell that the temperature is getting cooler as the altitude he is at 
 Option1: increases 
 Option2: decreases 
 Explanation: The stratosphere contains the ozone layer, the temperatures increase as altitude increases.
[A]: decreases


[Q]: Question: If Mona is producing sound waves by listening to her radio at night and she turns up the volume, what happens to the amount of energy being produced by the radio? 
 Option1: increases 
 Option2: decreases 
 Explanation: A higher-frequency wave has more energy than a lower-frequency wave with the same amplitude.
[A]: increases


[Q]: Question: Sasha is throwing bottles into the lake. Some bottles are filled with sand, and some only have a tiny bit of sand in them. The bottles with a tiny bit of sand will sink last because they are 
 Option1: less dense 
 Option2: more dense 
 Explanation: The more tightly packed the particles inside the material are, the more dense we say they are.
[A]:
less dense