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: John was looking at rocks in the valley and noticed something. The less resistant the rocks he looked at were, the amount they remained was 
 Option1: Shorter 
 Option2: Longer 
 Explanation: Different types of rocks weather at different rates. More resistant types of rocks will remain longer.
[EX A]: Shorter

[EX Q]: Question: When people move to an area what happens to the land? 
 Option1: cleared 
 Option2: kept the same 
 Explanation: More people also means more clearing of land for agriculture and development.
[EX A]: cleared

[EX Q]: Question: If Mona has filled a balloon with helium and she removes some gas from it, what happens to the likelihood that the helium particles will collide with each other? 
 Option1: more likely 
 Option2: less likely 
 Explanation: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.
[EX A]:
less likely