Task: Question Answering
Input (English): Question: Natasha climbs up a hill, and descends along the same way she went up. It takes her 4 hours to reach the top and 2 hours to come back down. If her average speed along the whole journey is 2 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?

 Option A: 1.5

 Option B: 2.5

 Option C: 3.75

 Option D: 5

 Option E: 7.5
Output (English): Option A