Task: Question Answering
Input (English): Problem: the area of circle o is added to its diameter . if the circumference of circle o is then subtracted from this total , the result is 12 . what is the radius of circle o ? 
Options: ['a ) – 2 / pi', 'b ) 2', 'c ) 3', 'd ) 4', 'e ) 6']
Output (English): e