Task: Question Answering
Input (English): Problem: the ratio of the radius of two circles is 2 : 3 , and then the ratio of their areas is ? 
Options: ['a ) 1 : 7', 'b ) 2 : 9', 'c ) 4 : 9', 'd ) 3 : 7', 'e ) 3 : 4']
Output (English): c