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: a train passes a station platform in 31 sec and a man standing on the platform in 20 sec . if the speed of the train is 54 km / hr . what is the length of the platform ? 
Options: a ) 228 , b ) 240 , c ) 165 , d ) 166 , e ) 1811

Ex Output:
c


Ex Input:
Problem: on a map the distance between two mountains is 312 inches . the actual distance between the mountains is 140 km . ram is camped at a location that on the map is 34 inch from the base of the mountain . how many km is he from the base of the mountain ? 
Options: a ) 14.83 , b ) 14.81 , c ) 14.8 , d ) 15.25 , e ) 14.12

Ex Output:
d


Ex Input:
Problem: a car travels at a speed of 65 miles per hour . how far will it travel in 5 hours ? 
Options: a ) 125 miles , b ) 225 miles , c ) 325 miles , d ) 425 miles , e ) 525 miles

Ex Output:

c