Task: Question Answering
Input (English): Question: A garrison of 400 men had a provision for 31 days. After 28 days 280 persons re-enforcement leave the garrison. Find the number of days for which the remaining ration will be sufficient?

 Option A: 10

 Option B: 88

 Option C: 77

 Option D: 51

 Option E: 21
Output (English): Option C