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 perimeter of an equilateral triangle is 60 . if one of the sides of the equilateral triangle is the side of an isosceles triangle of perimeter 50 , then how long is the base of isosceles triangle ? 
Options: a ) 5 , b ) 10 , c ) 15 , d ) 20 , e ) 25
Example Output: b

Example Input: Problem: if the area of a circle is 16 pi square feet , find its circumference . 
Options: a ) 8 pi feet , b ) 28 pi feet , c ) 38 pi feet , d ) 48 pi feet , e ) 58 pi feet
Example Output: a

Example Input: Problem: the length and breadth of a rectangle is increased by 30 % and 45 % respectively . what is the increase in the area ? 
Options: a ) 88.25 , b ) 87.5 , c ) 86.0 , d ) 88.0 , e ) 88.5
Example Output:
e