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

Example Input: Problem: how many of the positive factors of 17 are not factors of 34 ? 
Options: a ) 0 , b ) 1 , c ) 2 , d ) 3 , e ) 4
Example Output: a

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: nitin ranks 23 th in a class of 60 students . what is rank from the last ? 
Options: a ) 33 , b ) 38 , c ) 32 , d ) 28 , e ) 19
Example Output:
b