In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: if a number x is 10 % less than another number y and y is 10 % more than 125 , then x is equal to 
Options: a ) 143 , b ) 150 , c ) 123.75 , d ) 140.55 , e ) none

Ex Output:
c


Ex Input:
Problem: if w is the product of the integers from 1 to 30 , inclusive , what is the greatest integer k for which 3 ^ k is a factor of w ? 
Options: a ) 10 , b ) 12 , c ) 14 , d ) 16 , e ) 18

Ex Output:
c


Ex Input:
Problem: a person x started at 3 hours earlier at 40 km / h from a place p , then another person y followed him at 60 km / h . started his journey at 3 o ' clock , afternoon . what is the diference in time when x was 30 km ahead of y and when y was 30 km ahead of x ? 
Options: a ) 8 h , b ) 3 h , c ) 6 h , d ) 3 h , e ) 1 h

Ex Output:

b