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: how many odd numbers between 10 and 1400 are the squares of integers ?
Options: a ) 14 , b ) 17 , c ) 20 , d ) 23 , e ) 26
Example Output: b

Example Input: Problem: in measuring the sides of a rectangle , one side is taken 10 % in excess and other 5 % in deficit . find the error percentage in the area calculated from these measurements .
Options: a ) 3.5 % , b ) 2.4 % , c ) 3 % , d ) 4.5 % , e ) 2.6 %
Example Output: d

Example Input: Problem: the ratio of radius of a circle and the side of a square is 2 : 9 . find the ratio of their areas :
Options: a ) 2 : 1 , b ) 4 : 7 , c ) 8 : 77 , d ) 4 : 81 , e ) none
Example Output:
d