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 of length 250 m runs at a speed of 70 km / hr . what will be the time taken to cross any stationary object standing at the railway station ?
Options: a ) 20 sec , b ) 17.23 sec , c ) 12.86 sec , d ) 9.5 sec , e ) 8.5 sec

Ex Output:
c

Ex Input:
Problem: a cistern 4 meters long and 4 meters wide contains water up to a depth of 1 meter 25 cm . what is the total area of the wet surface ?
Options: a ) 28 , b ) 32 , c ) 36 , d ) 40 , e ) 44

Ex Output:
c

Ex Input:
Problem: an woman swims downstream 64 km and upstream 24 km taking 8 hours each time ; what is the speed of the current ?
Options: a ) 1.6 , b ) 1.8 , c ) 3.5 , d ) 1.5 , e ) 2.5

Ex Output:
e