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 ratio of radius of a circle and the side of a square is 2 : 3 . find the ratio of their areas : 
Options: a ) 2 : 1 , b ) 4 : 9 , c ) 8 : 77 , d ) 4 : 121 , e ) none

A: b
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Q: Problem: the radius of a cone is 10 m , height 21 m . the volume of the cone is : 
Options: ['a ) 2200', 'b ) 1100', 'c ) 5500', 'd ) 3300', 'e ) 1050']

A: a
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Q: Problem: 2 corner most boxes of a chess board ( diagonally opposite ) haven been cut out there ' s a rectangular block = 2 sqaures of chess board , how many such blocks can be placed on the chess board ? ” 
Options: a ) 27 , b ) 28 , c ) 29 , d ) 30 , e ) 31

A:
d
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