Task: Question Answering
Input (English): Question: A can do a work in 12days. When he had worked for 3days, B joinedhim. If they complete the work in 3more days, in how manydays can Balone finish the work?

 Option A: 2 days

 Option B: 4 days

 Option C: 5 days

 Option D: 6 days

 Option E: 9 days
Output (English): Option D