instruction:
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:
Question: Joe is pulling a rubber band with his fingers. When does the band have the most elastic force? 
 Option1: at rest 
 Option2: when stretched 
 Explanation: The elastic force increases the more the material is stretched or compressed.
answer:
when stretched


question:
Question: When two pieces of metal are rubbing together and oil is added between them the friction 
 Option1: decreases 
 Option2: increases 
 Explanation: To reduce friction, oil is added to the engine.
answer:
decreases


question:
Question: Don is watching rocks be eroded by water. Since the water is moving so fast and hard, Don can tell that the particles being carried away by the water are 
 Option1: larger 
 Option2: smaller 
 Explanation: In erosion, the more energy the water has, the larger the particle it can carry.
answer:

larger