Task: Question Answering
Input (English): Question: A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each route will take is the same. If they will go up the mountain at a rate of 6 miles per day and it will take them two days, how many miles long is the route down the mountain?

 Option A: 16

 Option B: 17

 Option C: 18

 Option D: 19

 Option E: 20
Output (English): Option C