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 sides of a triangle are in the ratio 5 : 12 : 13 and its perimeter is 360 m , its area is ? 
Options: a ) 180 , b ) 882 , c ) 277 , d ) 261 , e ) 281

Ex Output:
a


Ex Input:
Problem: if a is the smallest positive integer such that 3150 multiplied by a is the square of an integer , then a must be 
Options: a ) 2 , b ) 5 , c ) 6 , d ) 7 , e ) 14

Ex Output:

e