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 Q]: Problem: how many internal diagonals does a heptagon ( seven sided polygon ) have ? 
Options: a ) 7 , b ) 9 , c ) 14 , d ) 20 , e ) 35
[EX A]: c

[EX Q]: Problem: if radius of a circle is diminished by 10 % then its area is diminished by 
Options: ['a ) 22', 'b ) 19', 'c ) 877', 'd ) 26', 'e ) 271']
[EX A]: b

[EX Q]: Problem: a small table has a length of 12 inches and a breadth of b inches . cubes are placed on the surface of the table so as to cover the entire surface . the maximum side of such cubes is found to be 4 inches . also , a few such tables are arranged to form a square . the minimum length of side possible for such a square is 40 inches . find b . 
Options: a ) 8 , b ) 6 , c ) 24 , d ) 32 , e ) 48
[EX A]:
b