Task: Question Answering
Input (English): Question: A tap can fill a tank in 4 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?

 Option A: 3 hr

 Option B: 1 hr 30 min

 Option C: 2 hr 30 min

 Option D: 2 hr

 Option E: 4 hr
Output (English): Option C