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: a metallic sheet is of rectangular shape with dimensions 48 m x 36 m . from each of its corners , a square is cut off so as to make an open box . if the length of the square is 4 m , the volume of the box ( in m 3 ) is : 
Options: a ) 4480 , b ) 5120 , c ) 6420 , d ) 8960 , e ) 7960

Ex Output:
a


Ex Input:
Problem: how many 4 x 4 x 4 cubes could fit in a 9 x 13 x 16 box ? 
Options: a ) 22 , b ) 28 , c ) 29 , d ) 31 , e ) 32

Ex Output:
c


Ex Input:
Problem: three solid cubes of sides 1 cm , 6 cm and 8 cm are melted to form a new cube . find the surface area of the cube so formed 
Options: ['a ) 486', 'b ) 366', 'c ) 299', 'd ) 278', 'e ) 1888']

Ex Output:

a