In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: the radius of a wheel is 22.6 cm . what is the distance covered by the wheel in making 750 resolutions ? 
Options: a ) 754 m , b ) 704 m , c ) 1055.04 m , d ) 1058.04 m , e ) 204 m

Ex Output:
c


Ex Input:
Problem: 20 beavers , working together in a constant pace , can build a dam in 18 hours . how many hours will it take 12 beavers that work at the same pace , to build the same dam ? 
Options: a ) 22 . , b ) 24 . , c ) 30 . , d ) 36 , e ) 38 .

Ex Output:
c


Ex Input:
Problem: in what time will a railway train 60 m long moving at the rate of 72 kmph pass a telegraph post on its way ? 
Options: a ) 8 sec , b ) 3 sec , c ) 2 sec , d ) 6 sec , e ) 9 sec

Ex Output:

b