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'.

Example Input: Problem: in a 80 meters race a beats b by 56 m or 7 seconds . a ' s time over the course is : 
Options: a ) 3 seconds , b ) 12 seconds , c ) 10 seconds , d ) 18 seconds , e ) 28 seconds
Example Output: a

Example Input: Problem: express a speed of 46 kmph in meters per second ? 
Options: a ) 10.78 mps , b ) 12.78 mps , c ) 97.78 mps , d ) 17.78 mps , e ) 18.78 mps
Example Output: b

Example Input: Problem: a train 360 m long runs with a speed of 45 km / hr . what time will it take to pass a platform of 180 m long ? 
Options: a ) 38 sec , b ) 35 sec , c ) 43.2 sec , d ) 40 sec , e ) none of these
Example Output:
c