Task: Question Answering
Input (English): Problem: express the ratio 3 2 / 3 : 7 1 / 3 in its simplest form . 
Options: a ) 1 : 21 , b ) 1 : 1 , c ) 2 : 1 , d ) 1 : 2 , e ) 2 : 11
Output (English): d