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: Milo loved to make things out of clay. If he made a clay ball, what would happen to the ball's gravitational force if he added extra clay to it? 
 Option1: decrease 
 Option2: increase 
 Explanation: The gravitational force increases with mass and decreases with the distance between the bodies.
[A]: increase


[Q]: Question: Erin is trying to get her solution to have a pH as far from zero as possible. The best way for Erin to do that is to have the acidity of the solution 
 Option1: decrease 
 Option2: increase 
 Explanation: The more acidic a solution is, the closer its pH value will be to 0
[A]: decrease


[Q]: Question: If America is a rich nation and China is a poor nation, which nation uses less energy resources? 
 Option1: China 
 Option2: America 
 Explanation: Richer nations use far more energy resources, especially fossil fuels, than poorer nations do.
[A]:
China