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: the length of a rectangle is halved , while its breadth is tripled . what is the % change in area ? 
Options: a ) 30 % , b ) 40 % , c ) 50 % , d ) 60 % , e ) 65 %

Ex Output:
c


Ex Input:
Problem: the ratio between the perimeter and the width of a rectangle is 5 : 1 . if the area of the rectangle is 54 square centimeters , what is the length of the rectangle in centimeters ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10

Ex Output:
d


Ex Input:
Problem: the ratio of the volumes of two cubes is 1000 : 3375 . what is the ratio of their total surface areas ? 
Options: a ) 81 : 121 , b ) 4 : 9 , c ) 729 : 1331 , d ) 27 : 121 , e ) none of these

Ex Output:

b