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: how many squares are there between 2011 to 2300 ? ? ? ? 
Options: ['a ) 3', 'b ) 4', 'c ) 5', 'd ) 6', 'e ) 7']

Ex Output:
a


Ex Input:
Problem: one side of a rectangular field is 15 m and one of its diagonals is 17 m . find the area of the field in meter square 
Options: a ) 100 , b ) 110 , c ) 120 , d ) 130 , e ) 140

Ex Output:
c


Ex Input:
Problem: find the curved surface area , if the radius of a cone is 28 m and slant height is 30 m ? 
Options: a ) 2550 , b ) 2640 , c ) 3960 , d ) 4280 , e ) 5490

Ex Output:

b