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: if the height of a cone is increased by 140 % then its volume is increased by ? 
Options: ['a ) 100', 'b ) 140', 'c ) 998', 'd ) 729', 'e ) 2879']
Example Output: b

Example Input: Problem: a rectangular lawn of length 200 m by 120 m has two roads running along its center , one along the length and the other along the width . if the width of the roads is 5 m what is the area y covered by the two roads ? 
Options: a ) 400 , b ) 1550 , c ) 1575 , d ) 1600 , e ) 1625
Example Output: c

Example Input: Problem: each side of a rectangular field diminished by 40 % . by how much per cent is the area of the field diminished ? 
Options: ['a ) 32', 'b ) 64', 'c ) 25', 'd ) 16', 'e ) none']
Example Output:
b