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: Milo lives in a small city, but the city has recently become more popular with young people. If more young people begin leaving the city, what happens to the growth rate of the city? 
 Option1: increases 
 Option2: decreases 
 Explanation: In exponential growth as the population size increases, the growth rate also increases.
decreases

Question: If Mona is adding chemicals to her swimming pool and she lowers the pH value of the water, what happens to the acidity of the water in the pool? 
 Option1: increase 
 Option2: decrease 
 Explanation: The lower the pH value is, the greater is the concentration of hydrogen ions and the stronger the acid.
decrease

Question: Dan is looking at shells that will be bad candidates for fossilization. He chooses the shells that are 
 Option1: softer 
 Option2: harder 
 Explanation: Hard shells fossilize more readily than soft bodied organisms, as they are better at resisting decay, take significantly longer to break down, and have a greater chance of surviving burial under layers of sediment.

softer