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

Example Input: Problem: the ratio between the sale price and the cost price of an article is 9 : 5 . what is the ratio between the profit and the cost price of that article ?
Options: a ) 23 , b ) 1 : 2 , c ) 4 : 5 , d ) 3 : 5 , e ) 25
Example Output: c

Example Input: Problem: find the two digit number , such that the ratio is 7 / 4 of original number to the number formed by reversing the digits .
Options: a ) 20 , b ) 21 , c ) 22 , d ) 23 , e ) 24
Example Output: b

Example Input: Problem: the ratio of buses to cars on river road is 1 to 10 . if there are 90 fewer buses than cars on river road , how many cars are on river road ?
Options: a ) 50 , b ) 40 , c ) 100 , d ) 30 , e ) 20
Example Output:
c