In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: 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']
[A]: b

[Q]: 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
[A]: b

[Q]: Problem: the ratio of the radius of two circles is 2 : 3 , and then the ratio of their areas is ?
Options: ['a ) 1 : 7', 'b ) 2 : 9', 'c ) 4 : 9', 'd ) 3 : 7', 'e ) 3 : 4']
[A]:
c