Task: Question Answering
Input (English): Problem: x and y are positive integers . when x is divided by 9 , the remainder is 2 , and when x is divided by 7 , the remainder is 4 . when y is divided by 11 , the remainder is 3 , and when y is divided by 13 , the remainder is 12 . what is the least possible value of y - x ? 
Options: a ) 12 , b ) 13 , c ) 14 , d ) 15 , e ) 16
Output (English): c