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 positive number , when squared , is equal to the cube of the positive square root of 17 ? 
Options: ['a ) 64', 'b ) 32', 'c ) 8', 'd ) 4', 'e ) 2']
Example Output: c

Example Input: Problem: the side of a rhombus is 24 m and length of one of its diagonals is 18 m . the area of the rhombus is ? 
Options: a ) 410.47 , b ) 403.47 , c ) 420.47 , d ) 400.47 , e ) 300.47
Example Output: d

Example Input: Problem: the area of a base of a cone is 30 cm 2 . if the height of the cone is 6 cm , find its volume ? 
Options: ['a ) 87', 'b ) 16', 'c ) 17', 'd ) 60', 'e ) 18']
Example Output:
d