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: if the radius of the sphere is 14 m . then its total surface area is
Options: ['a ) 2644', 'b ) 2446', 'c ) 2464', 'd ) 6442', 'e ) 6424']

Ex Output:
c

Ex Input:
Problem: if a number is subtracted from its square we get 272 . find the number ?
Options: ['a ) 7', 'b ) 21', 'c ) 19', 'd ) 15', 'e ) 17']

Ex Output:
e

Ex Input:
Problem: a rectangular tiled patio is composed of 90 square tiles . the rectangular patio will be rearranged so that there will be 2 fewer columns of tiles and 4 more rows of tiles . after the change in layout , the patio will still have 90 tiles , and it will still be rectangular . how many rows are in the tile patio before the change in layout ?
Options: a ) 5 , b ) 6 , c ) 10 , d ) 11 , e ) 28

Ex Output:
d