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 increased by 40 % while its width is halved . what is the % change in area ?
Options: ['a ) 25 %', 'b ) 30 %', 'c ) 50 %', 'd ) 65 %', 'e ) 70 %']

Ex Output:
b

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 the area of a square with sides of length 9 centimeters is equal to the area of a rectangle with a width of 3 centimeters , what is the length of the rectangle , in centimeters ?
Options: ['a ) 4', 'b ) 27', 'c ) 12', 'd ) 16', 'e ) 18']

Ex Output:
b