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: a rectangular field has area equal to 150 sq m and perimeter 50 m . its length and breadth must be ?
Options: ['a ) 15 m , 15 m', 'b ) 15 m , 90 m', 'c ) 16 m , 10 m', 'd ) 15 m , 10 m', 'e ) 15 m , 30 m']
Example Output: d

Example Input: Problem: the total surface area of a cuboid length 12 m , breadth 10 m and height 8 m .
Options: ['a ) 576', 'b ) 566', 'c ) 596', 'd ) 556', 'e ) 586']
Example Output: c

Example Input: Problem: what will be the ratio between the area of a rectangle and the area of a triangle with one of the sides of the rectangle as base and a vertex on the opposite side of the rectangle ?
Options: ['a ) 1 : 1', 'b ) 1 : 2', 'c ) 2 : 3', 'd ) 2 : 1', 'e ) none of these']
Example Output:
d