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 rectangle is thrice its breadth and its perimeter is 72 m , find the area of the rectangle ? 
Options: a ) 432 , b ) 212 , c ) 243 , d ) 992 , e ) 212

Ex Output:
c


Ex Input:
Problem: the width of a rectangular hall is ½ of its length . if the area of the hall is 128 sq . m , what is the difference between its length and breadth ? 
Options: a ) 8 m , b ) 10 m , c ) 12 m , d ) 15 m , e ) 17 m

Ex Output:
a


Ex Input:
Problem: in a circle with a radius of 6 , what is the area of the biggest rectangle that can be cut out of this circle ? 
Options: ['a ) 12', 'b ) 96', 'c ) 50', 'd ) 72', 'e ) 144']

Ex Output:

d