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: Alan has a rubber band on his hands. He pushes his hands together and the rubber bands force 
 Option1: increases 
 Option2: decreases 
 Explanation: The farther apart you move your hands, the stronger the force of the rubber band pulling your hands together.

SOLUTION: decreases

PROBLEM: Question: Michel watched the slow waves hit shore with power. The waves were _____. 
 Option1: big 
 Option2: small 
 Explanation: The size of an ocean wave depends on how fast, over how great a distance, and how long the wind blows. The greater each of these factors is, the bigger a wave will be.

SOLUTION: small

PROBLEM: Question: Caucasian Americans have lighter skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among Caucasian Americans is _____ than among other Americans? 
 Option1: more prevalent 
 Option2: less prevalent 
 Explanation: Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D.

SOLUTION:
less prevalent