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: an equilateral triangle and three squares are combined as shown above , forming a shape of area 48 + 4 √ 3 . what is the perimeter of the shape formed by the triangle and squares ? 
Options: ['a ) 18', 'b ) 27', 'c ) 36', 'd ) 48', 'e ) 64']

Ex Output:
c


Ex Input:
Problem: the largest four - digit number which is a perfect cube , is 
Options: ['a ) 8000', 'b ) 9261', 'c ) 9999', 'd ) none of these', 'e ) can not be determined']

Ex Output:
b


Ex Input:
Problem: what is the perimeter of a square with area 9 p ^ 2 / 64 ? 
Options: ['a ) 3 p / 2', 'b ) 3 p ^ 2 / 4', 'c ) 3 p', 'd ) 3 p ^ 2', 'e ) 4 p / 3']

Ex Output:

a