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

Ex Input:
Problem: if ryan and smith car ratio is 5 : 8 . ryan bought 6 new car and smith bought 2 new car . now , smith has 18 car . what is their car ratio now ? 
Options: a ) 5 : 4 , b ) 3 : 2 , c ) 8 : 9 , d ) 6 : 5 , e ) 7 : 5

Ex Output:
c


Ex Input:
Problem: the ratio between the current age of a and b is 6 : 7 . if b is 4 years old than a . what will be the ratio of the ages of a and b after 4 years ? 
Options: a ) 7 : 8 , b ) 8 : 9 , c ) 4 : 6 , d ) 4 : 8 , e ) 5 : 8

Ex Output:
a


Ex Input:
Problem: if 73 ! has 16 zeroes at the end , how many zeroes will 80 ! have at the end ? 
Options: a ) 16 , b ) 17 , c ) 18 , d ) 19 , e ) 20

Ex Output:

d