Task: Question Answering
Input (English): Question: Mr. Smith calculated the average of 10three digit numbers. But due to a mistake he reversed the digits of a number and thus his average increased by 9.9. The difference between the unit digit and hundreds digit of that number is :

 Option A: a

 Option B: b

 Option C: c

 Option D: d

 Option E: e
Output (English): Option D