Task: Question Answering
Input (English): Question: A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start the work together but C leaves 4 days before the completion of the work. In how many days is the work done?

 Option A: 15 days

 Option B: 14 days

 Option C: 13 days

 Option D: 11 days

 Option E: 10 days
Output (English): Option D