In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: a rectangular field has a length 10 meters more than it is width . if the area of the field is 119 , what is the length ( in meters ) of the rectangular field ? 
Options: a ) 13 , b ) 15 , c ) 17 , d ) 19 , e ) 21

Ex Output:
c


Ex Input:
Problem: how many internal diagonals does a hexagon ( 6 sided polygon ) have ? 
Options: a ) 5 , b ) 6 , c ) 8 , d ) 9 , e ) 10

Ex Output:
d


Ex Input:
Problem: the ratio of the volumes of two cubes is 512 : 729 . what is the ratio of their total surface areas ? 
Options: a ) 1 : 22 , b ) 81 : 12 , c ) 41 : 46 , d ) 41 : 19 , e ) 84 : 12

Ex Output:

c