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 Q]: 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 A]: b

[EX Q]: Problem: the radius of the base of cone is 3 cm and height is 4 cm . find the volume of the cone ? 
Options: ['a ) 12', 'b ) 75', 'c ) 97', 'd ) 15', 'e ) 91']
[EX A]: a

[EX Q]: Problem: the area of sector of a circle whose radius is 18 metro and whose angle at the center is 42 â ° is ? 
Options: a ) 52.6 , b ) 52.9 , c ) 52.8 , d ) 118.8 , e ) 52.2
[EX A]:
d