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.

[EX Q]: Question: What will happen to the levels of pollution on Earth if the population increases? 
 Option1: they will rise 
 Option2: they will fall 
 Explanation: For example, more people on the Earth means more people contributing to global warming and pollution.
[EX A]: they will rise

[EX Q]: Question: Will has two screws of the same length. One has 20 threads; the other has 200 threads. The screw with _____ threads likely needs less force to penetrate wood. 
 Option1: 20 
 Option2: 200 
 Explanation: Therefore, if the threads on a screw are closer together, you need to apply less force to penetrate the wood or other object.
[EX A]: 200

[EX Q]: Question: If you rub your hands together slowly you get _____ heat 
 Option1: more 
 Option2: less 
 Explanation: Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy.
[EX A]:
less