Task: Question Answering
Input (English): Question: A boatman goes 3 km against the current of the stream in 3 hour and goes 1 km along the current in 30 minutes. How long will it take to go 3 km in stationary water?

 Option A: 5 hours

 Option B: 4 hours

 Option C: 3 hours

 Option D: 2 hours

 Option E: 1 hours
Output (English): Option D