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 sum of 4 consecutive even numbers is 140 . what would be the smallest number ? 
Options: a ) 32 , b ) 88 , c ) 70 , d ) 123 , e ) 12

Ex Output:
a


Ex Input:
Problem: annie and sam set out together on bicycles traveling at 15 and 12 km per hour respectively . after 40 minutes , annie stops to fix a flat tire . if it takes annie 30 minutes to fix the flat tire and sam continues to ride during this time , how many minutes will it take annie to catch up with sam assuming that annie resumes riding at 15 km per hour ? 
Options: a ) 20 , b ) 40 , c ) 60 , d ) 80 , e ) 100

Ex Output:
d


Ex Input:
Problem: a train is 320 meter long is running at a speed of 45 km / hour . in what time will it pass a bridge of 140 meter length ? 
Options: a ) 11 seconds , b ) 38 seconds , c ) 40 seconds , d ) 88 seconds , e ) 36.8 seconds

Ex Output:

e