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 circular ground whose radius is 15 metres , has a 1.2 metre - broad garden around it . what is the area of the garden in square metres ?
Options: ['a ) 118.67', 'b ) 116.67', 'c ) 117.67', 'd ) 120.56', 'e ) 120.57']

Ex Output:
c

Ex Input:
Problem: the area of sector of a circle whose radius is 12 metro and whose angle at the center is 42 is ?
Options: a ) 56.8 m 2 , b ) 82.9 m 2 , c ) 52.8 m 2 , d ) 17.9 m 2 , e ) 72.9 m 2

Ex Output:
c

Ex Input:
Problem: a trainer is standing in one corner of a square ground of side 25 m . his voice can be heard upto 140 m . find the area of the ground in which his voice can be heard ?
Options: ['a ) 12300', 'b ) 14500', 'c ) 15400', 'd ) 16700', 'e ) 18200']

Ex Output:
c