Task: Question Answering
Input (English): Problem: if the volume of two cubes are in the ratio 8 : 1 , the ratio of their edges is : 
Options: ['a ) 2 : 1', 'b ) 3 : 2', 'c ) 3 : 5', 'd ) 3 : 7', 'e ) none of these']
Output (English): a