Task: Question Answering
Input (English): Problem: a student finds the average of 9 positive integers . each integer contains two digits . by mistake , the boy interchanges the digits of one number say pq for qp . due to this , the average becomes 1 less than the previous one . what was the difference of the two digits p and q ? 
Options: a ) 8 , b ) 6 , c ) 1 , d ) 4 , e ) 2
Output (English): c