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: a volume of 10936 l water is in a container of sphere . how many hemisphere of volume 4 l each will be required to transfer all the water into the small hemispheres ? 
Options: ['a ) 2812', 'b ) 8231', 'c ) 2734', 'd ) 4222', 'e ) 4254']

Ex Output:
c


Ex Input:
Problem: what positive number , when squared , is equal to the cube of the positive square root of 14 ? 
Options: a ) 64 , b ) 32 , c ) 8 , d ) 4 , e ) 2

Ex Output:
d


Ex Input:
Problem: two isosceles triangles have equal vertical angles and their areas are in the ratio 16 : 49 . find the ratio of their corresponding heights . 
Options: a ) 4 / 5 , b ) 5 / 4 , c ) 3 / 2 , d ) 4 / 7 , e ) 2 / 3

Ex Output:

d