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

Example Input: Problem: ashley paid 5 dollars for 1 notebook and 1 pencil . if both prices were integers , how many pencils did ashley buy if she paid 93 dollars for the pencils and for 15 notebooks ? 
Options: a ) 6 . , b ) 16 . , c ) 18 , d ) 21 , e ) 26
Example Output: d

Example Input: Problem: the ratio between the number of sheep and the number of horses at the stewart farm is 5 to 7 , if each horse is fed 230 ounces of horse food per day and the farm needs a total 12,880 ounces of horse food per day , what is the number of sheep in the farm ? 
Options: a ) 18 , b ) 28 , c ) 40 , d ) 56 , e ) 60
Example Output: c

Example Input: Problem: find the compound ratio of ( 1 : 2 ) , ( 1 : 3 ) and ( 3 : 5 ) is 
Options: a ) 1 : 10 , b ) 2 : 3 , c ) 3 : 4 , d ) 4 : 5 , e ) 3 : 2
Example Output:
a