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 area of a square field is 1600 km 2 . how long will it take for a horse to run around at the speed of 16 km / h ? 
Options: a ) 12 h , b ) 10 h , c ) 8 h , d ) 6 h , e ) none of these

Ex Output:
b


Ex Input:
Problem: the length of a rectangle is four times its width . if the area is 100 m 2 what is the length of the rectangle ? 
Options: a ) 50 m , b ) 40 m , c ) 80 m , d ) 20 m , e ) 70 m

Ex Output:
d


Ex Input:
Problem: the volumes of two cones are in the ratio 1 : 30 and the radii of the cones are in the ratio of 1 : 2 . what is the length of the wire ? 
Options: a ) 6 : 5 , b ) 6 : 9 , c ) 6 : 2 , d ) 2 : 2 , e ) 2 : 8

Ex Output:

a