TASK DEFINITION: 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.
PROBLEM: Question: Katie wants to get light to turn to rainbow colors by using a lens to filter the light through. In order to get the most colors, Katie will use a lens that is 
 Option1: flat 
 Option2: curved 
 Explanation: The more curved the surface of a lens is, the more it refracts the light that passes through it.

SOLUTION: curved

PROBLEM: Question: Increasing the mass of an object causes its inertia to 
 Option1: increase 
 Option2: decrease 
 Explanation: The full box is harder to move because it has greater mass and therefore greater inertia.

SOLUTION: increase

PROBLEM: Question: When humans grow trees what happens to the population of the animals in the forest 
 Option1: Lower 
 Option2: Increase 
 Explanation: The forest habitat of elephants has also decreased in size due to humans moving in, so the numbers of the elephants have decreased.

SOLUTION:
Increase