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

Ex Input:
Problem: if there are 10 apples and 20 oranges , what is the ratio of apples to oranges ? 
Options: a ) 10 : 20 , b ) 2 : 4 , c ) 1 : 2 , d ) 4 : 8 , e ) it can not be determined from the information given

Ex Output:
c


Ex Input:
Problem: the ratio of spinsters to cats is 2 to 7 . if there are 55 more cats than spinsters , how many spinsters are there ? 
Options: a ) 20 , b ) 21 , c ) 22 , d ) 23 , e ) 24

Ex Output:
c


Ex Input:
Problem: the ratio of two numbers is 5 : 9 . if each number is decreased by 5 , the ratio becomes 5 : 11 . find the numbers . 
Options: a ) 30 , 19 , b ) 21 , 37 , c ) 15 , 34 , d ) 15 , 27 , e ) none of these

Ex Output:

d