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: the slant height of a cone is 12 cm and radius of the base is 4 cm , find the curved surface of the cone . 
Options: a ) 33 , b ) 88 , c ) 48 , d ) 77 , e ) 27
Example Output: c

Example Input: Problem: the parameter of a square is equal to the perimeter of a rectangle of length 22 cm and breadth 20 cm . find the circumference of a semicircle whose diameter is equal to the side of the square . 
Options: a ) 23.56 , b ) 33.0 , c ) 23.55 , d ) 23.53 , e ) 23.57
Example Output: b

Example Input: Problem: if the area of a square with sides of length 11 centimeters is equal to the area of a rectangle with a width of 11 centimeters , what is the length of the rectangle , in centimeters ? 
Options: a ) 4 , b ) 8 , c ) 11 , d ) 16 , e ) 18
Example Output:
c