Task: Question Answering
Input (English): Question: Bruce and Anne can clean their house in 4 hours working together at their respective constant rates. If Anne’s speed were doubled, they could clean their house in 3 hours working at their respective rates. How many D hours does it currently take Anne to clean the house on her own?

 Option A: 6

 Option B: 7

 Option C: 8

 Option D: 12

 Option E: 14
Output (English): Option D