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 box measuring 27 inches long by 15 inches wide by 6 inches deep is to be filled entirely with identical cubes . no space is to be left unfilled . what is the smallest number of cubes that can accomplish this objective ? 
Options: ['a ) 90', 'b ) 180', 'c ) 210', 'd ) 240', 'e ) 864']

Ex Output:
a


Ex Input:
Problem: if the volume of two cubes are in the ratio 125 : 1 , the ratio of their edges is : 
Options: a ) 3 : 1 , b ) 5 : 1 , c ) 3 : 5 , d ) 3 : 7 , e ) none of these

Ex Output:
b


Ex Input:
Problem: the base of a right triangle is 8 and hypotenuse is 10 . its area is ? 
Options: ['a ) 12', 'b ) 80', 'c ) 59', 'd ) 24', 'e ) 25']

Ex Output:

d