In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: Problem: if the radius of a circle is decreased 20 % , what happens to the area ? 
Options: a ) 10 % decrease , b ) 20 % decrease , c ) 36 % decrease , d ) 40 % decrease , e ) 50 % decrease
[A]: c


[Q]: Problem: find the area of a parallelogram with base 18 cm and height 10 cm ? 
Options: a ) 281 , b ) 284 , c ) 288 , d ) 255 , e ) 180
[A]: e


[Q]: Problem: oy started cycling along the boundaries of a square field from corner point a . after half an hour he reached the corner point c , diagonally opposite to a . if his speed was 8 km / hr , the area of the filed in square km is ? 
Options: ['a ) 64', 'b ) 4', 'c ) 16', 'd ) 9', 'e ) 5']
[A]:
b