In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: what is the smallest positive integer x such that 864 x is the cube of a positive integer 
Options: a ) 6 , b ) 12 , c ) 9 , d ) 5 , e ) 2
Example Output: e

Example Input: Problem: the side of a square has the length of 6 . what is the area of the region shaded ? 
Options: ['a ) 48 - 8 π', 'b ) 48 - 6 π', 'c ) 24 + 6 π', 'd ) 16 + 8 π', 'e ) 64 - 8 π']
Example Output: b

Example Input: Problem: the circumferences of two circles are 660 meters and 704 meters . find the difference between the areas of the larger and the smaller circles ? 
Options: a ) 2996 sq m , b ) 4774 sq m , c ) 4312 sq m , d ) 2768 sq m , e ) 2786 sq m
Example Output:
b