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 edges of a cuboid are 4 cm , 4 cm and 6 cm . find the volume of the cuboid ?
Options: a ) 90 , b ) 60 , c ) 96 , d ) 80 , e ) 72

Ex Output:
c

Ex Input:
Problem: a car drives 90 miles on local roads at 30 mph , and 75 miles on the highway at 60 mph , what is the average speed of the entire trip ?
Options: a ) 36 mph , b ) 40 mph , c ) 39 mph , d ) 42 mph , e ) 38 mph

Ex Output:
c

Ex Input:
Problem: how long does a train 130 m long running at the speed of 98 km / hr takes to cross a bridge 160 m length ?
Options: a ) 13.9 sec , b ) 13.1 sec , c ) 17.9 sec , d ) 61.9 sec , e ) 47.98 sec

Ex Output:
b