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: 6 points lie on the circumference of a ellipse . what is the positive difference between the number of triangles and the number of quadrilaterals that can be created by connecting these points ? 
Options: a ) 4 , b ) 6 , c ) 5 , d ) 15 , e ) 20

Ex Output:
c


Ex Input:
Problem: what is the area of a square field whose diagonal of length 22 m ? 
Options: a ) 300 sq m , b ) 220 sq m , c ) 200 sq m , d ) 400 sq m , e ) 800 sq m

Ex Output:
b


Ex Input:
Problem: if n is the smallest integer such that 432 times n is the square of an integer , what is the value of n ? 
Options: ['a ) 2', 'b ) 3', 'c ) 6', 'd ) 12', 'e ) 24']

Ex Output:

b