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: if one length of a square is tripled , and the original parameter is 4 y . what is the new length of one of the sides ? 
Options: ['a ) 12 y / 3', 'b ) 2 y / 2', 'c ) 6 y / 3', 'd ) 12 y / 4', 'e ) 4 y / 3']

Ex Output:
d


Ex Input:
Problem: if 36 men can do a piece of work in 25 hours , in how many hours will 12 men do it ? 
Options: a ) 22 , b ) 38 , c ) 60 , d ) 88 , e ) 75

Ex Output:
e


Ex Input:
Problem: how long does a train 110 m long traveling at 60 kmph takes to cross a bridge of 140 m in length ? 
Options: a ) 16.5 , b ) 16.0 , c ) 15 , d ) 16.8 , e ) 16.1

Ex Output:

c