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 volume of a box with a square base is 128 cubic cm . the area of the base of the box is 8 inches more than the height . what is the length of the base of the box ? 
Options: ['a ) 4 cm', 'b ) 8 cm', 'c ) 16 cm', 'd ) 24 cm', 'e ) none of the above']

Ex Output:
a


Ex Input:
Problem: find the area of a rhombus one side of which measures 20 cm and one diagonal is 28 cm . 
Options: ['a ) 200 cm 2', 'b ) 300 cm 2', 'c ) 400 cm 2', 'd ) 448 cm 2', 'e ) 100 cm 2']

Ex Output:
d


Ex Input:
Problem: a hall is 15 m long and 12 m broad . if the sum of the areas of the floor and the ceiling is equal to the sum of areas of the four walls , the volume of hall is ? 
Options: ['a ) 1100', 'b ) 1200', 'c ) 1300', 'd ) 1400', 'e ) 1500']

Ex Output:

b