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

Example Input: Problem: in a ratio which is equal to 4 : 6 , if the antecedent is 20 , then the consequent is ? 
Options: a ) 72 , b ) 85 , c ) 30 , d ) 51 , e ) 45
Example Output: c

Example Input: Problem: the ratio between the sale price and the cost price of an article is 6 : 5 . what is the ratio between the profit and the cost price of that article ? 
Options: a ) 2 : 9 , b ) 1 : 5 , c ) 3 : 6 , d ) 2 : 0 , e ) 2 : 1
Example Output: b

Example Input: Problem: the number of stamps that p and q had were in the ratio of 5 : 3 respectively . after p gave q 10 stamps , the ratio of the number of p ' s stamps to the number of q ' s stamps was 9 : 7 . as a result of the gift , p had how many more stamps than q ? 
Options: a ) 20 , b ) 30 , c ) 40 , d ) 60 , e ) 90
Example Output:
a