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: find the area of a parallelogram with base 12 cm and height 10 cm ? 
Options: a ) 297 cm 2 , b ) 384 cm 2 , c ) 120 cm 2 , d ) 267 cm 2 , e ) 186 cm 2

Ex Output:
c


Ex Input:
Problem: the radius of a cylinder is 2 r units and height is 3 r units . find the curved surface ? 
Options: a ) 18 π r 2 , b ) 12 π r 2 , c ) 3 π r 2 , d ) 6 π r 2 , e ) 9 π r 2

Ex Output:
b


Ex Input:
Problem: if the diameter of circle r is 50 % of the diameter of circle s , the area of circle r is what percent of the area of circle s ? 
Options: a ) 35 % , b ) 25 % , c ) 20 % , d ) 15 % , e ) 10 %

Ex Output:

b