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: two cars , car 1 and car 2 move towards each other from e and y respectively with respective speeds of 20 m / s and 15 m / s . after meeting each other car 1 reaches y in 10 seconds . in how many seconds does car 2 reach e starting from y ?
Options: a ) 15.5 sec , b ) 8.4 sec , c ) 33.6 sec , d ) 31.11 sec , e ) 16.8 sec
Example Output: d

Example Input: Problem: find the length of the wire required to go 15 times round a square field containing 69696 m 2 .
Options: a ) 15840 , b ) 15848 , c ) 15828 , d ) 27892 , e ) 22892
Example Output: a

Example Input: Problem: a train covers a distance of 12 km in 10 min . if it takes 2 sec to pass a telegraph post , then the length of the train is ?
Options: a ) 40 , b ) 80 , c ) 20 , d ) 100 , e ) 60
Example Output:
a