Task: Question Answering
Input (English): Problem: in the rectangular coordinate system , points ( 8 , 0 ) and ( – 8 , 0 ) both lie on circle c . what is the maximum possible value of the radius of c ? 
Options: ['a ) 2', 'b ) 4', 'c ) 8', 'd ) 16', 'e ) none of the above']
Output (English): c