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: if each edge of a cube is doubled , then its volume : 
Options: ['a ) becomes 8 times', 'b ) becomes 9 times', 'c ) is double', 'd ) becomes 6 times', 'e ) none']

Ex Output:
a


Ex Input:
Problem: find the area of a parallelogram with base 18 cm and height 10 cm ? 
Options: a ) 281 , b ) 284 , c ) 288 , d ) 255 , e ) 180

Ex Output:
e


Ex Input:
Problem: the area of a triangle will be when a = 1 m , b = 2 m , c = 5 m , a , b , c being lengths of respective sides ? 
Options: a ) 3 , b ) 6 , c ) 4 , d ) 9 , e ) 1

Ex Output:

c