Task: Question Answering
Input (English): Question: in 10 year, A willbe twice as old as B was 10 year ago. if A is now 9 year older then B, the present age of B is

 Option A: 19 years

 Option B: 29 years

 Option C: 39 years

 Option D: 49 years

 Option E: None of these
Output (English): Option C