Task: Question Answering
Input (English): Problem: the diameters of two spheres are in the ratio 1 : 2 what is the ratio of their surface area ? 
Options: ['a ) 1 : 0', 'b ) 1 : 4', 'c ) 1 : 6', 'd ) 1 : 2', 'e ) 1 : 1']
Output (English): b