In this task, you need to provide the correct option for a given problem from the provided options.

Ex Input:
Problem: if 0.4 of a number is equal to 0.07 of another number , the ratio of the numbers i 
Options: a ) 2 : 3 , b ) 7 : 40 , c ) 3 : 20 , d ) 20 : 3 , e ) none

Ex Output:
b


Ex Input:
Problem: if log 1087.5 = 1.9421 , then the number of digits in ( 875 ) 10 is ? 
Options: a ) 30 , b ) 28 , c ) 27 , d ) 26 , e ) 25

Ex Output:
a


Ex Input:
Problem: the compound ratio of 7 : 6 , 3 : 2 and 4 : 5 ? 
Options: a ) 7 : 5 , b ) 1 : 87 , c ) 1 : 6 , d ) 1 : 9 , e ) 1 : 2

Ex Output:

a