Task: Question Answering
Input (English): Problem: the compound ratio of 2 / 3 , 6 / 7 , 1 / 3 and 1 / 9 is given by ? 
Options: a ) 7 / 98 , b ) 1 / 48 , c ) 4 / 189 , d ) 1 / 96 , e ) 1 / 68
Output (English): c