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.

Question: Chris is studying two countries. He finds that China has half as many factories putting out fossil fuels into the air than the United States. Based on this information, the factories in _____ are causing more air pollution. 
 Option1: United States 
 Option2: China 
 Explanation: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.
United States

Question: If Mona begins using less nonrenewable resources what will happen to the length of time those resources will last? 
 Option1: decrease 
 Option2: increase 
 Explanation: Using less nonrenewable resources means that they will last longer.
increase

Question: Tina heats some oxygen gas. The oxygen particles will move 
 Option1: faster 
 Option2: slower 
 Explanation: If the gas is heated, the particles will move faster as they gain more energy.

faster