Task: Question Answering
Input (English): Problem: if 3 a = 4 b and ab ≠ 0 , what is the ratio of a / 4 to b / 3 ? 
Options: a ) 64 / 27 , b ) 9 / 16 , c ) 1 , d ) 6 / 8 , e ) 8 / 6
Output (English): c