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: When we look at animals when their population gets bigger what happens to each animal? 
 Option1: grow bigger 
 Option2: shrink 
 Explanation: In exponential growth as the population size increases, the growth rate also increases.

A: grow bigger
****
Q: Question: The reason that things don't rotate around the sun is because it is 
 Option1: small 
 Option2: large 
 Explanation: The greater the mass of the objects, the stronger the gravitational force of attraction between them.

A: small
****
Q: Question: If Mona is holding two rocks in her hands and she moves them closer together, what will happen to the force of magnetic attraction between the rocks? 
 Option1: increase 
 Option2: decrease 
 Explanation: The smaller the distance between the objects, the greater the force of magnetic attraction.

A:
increase
****