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 Input:
Problem: the breath of a rectangle is three - fifths of the radius of a circle . the radius of the circle is equal to the side of the square , whose area is 2025 sq . units . what is the area ( in sq . units ) of the rectangle if the rectangle if the length is 10 units ? 
Options: ['a ) 370 sq . units', 'b ) 270 sq . units', 'c ) 170 sq . units', 'd ) 470 sq . units', 'e ) 570 sq . units']

Ex Output:
b


Ex Input:
Problem: a math teacher has 24 cards , each of which is in the shape of a geometric figure . half of the cards are rectangles , and a third of the cards are rhombuses . if 8 cards are squares , what is the maximum possible number of cards that re circles . 
Options: a ) 7 , b ) 10 , c ) 11 , d ) 12 , e ) 13

Ex Output:
a


Ex Input:
Problem: if a square mirror has a 20 - inch diagonal , what is the approximate perimeter e of the mirror , in inches ? 
Options: ['a ) 40', 'b ) 60', 'c ) 80', 'd ) 100', 'e ) 120']

Ex Output:

b