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

Example Input: Problem: find the compound ratio of ( 2 : 3 ) , ( 6 : 11 ) and ( 11 : 2 ) is 
Options: a ) 3 : 2 , b ) 2 : 1 , c ) 1 : 2 , d ) 4 : 5 , e ) 2 : 3
Example Output: b

Example Input: Problem: a bag contains 5 green and 8 white balls . if two balls are drawn simultaneously , the probability that both are of the same colour is 
Options: a ) 8 / 15 , b ) 2 / 5 , c ) 3 / 5 , d ) 11 / 15 , e ) 19 / 39
Example Output: e

Example Input: Problem: if a positive integer n has 211 factors , then how many prime factors does n have ? 
Options: a ) 3 , b ) 2 , c ) can not be determined , d ) 4 , e ) 1
Example Output:
e