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: 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.
[EX A]: grow bigger

[EX Q]: Question: As waves get smaller the frequency of them 
 Option1: increases 
 Option2: decreases 
 Explanation: Wave frequency can be measured by counting the number of crests or compressions that pass the point in 1 second or other time period. The higher the number is, the greater is the frequency of the wave.
[EX A]: increases

[EX Q]: Question: Anna swims across the surface of a lake and later she plunges several feet below the surface to explore. At which depth will the temperature of the water be colder 
 Option1: surface of water 
 Option2: several feet deep in water? 
 Explanation: Water also gets colder as you go deeper.
[EX A]:
several feet deep in water?