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

Example Input: Problem: a jar contains 20 red , 20 blue , 6 yellow and 4 pink balls . if two balls are to be selected at random and without replacement , approximately what is the probability both of them to be the same colour ? 
Options: a ) 1 / 25 , b ) 1 / 15 , c ) 1 / 3 , d ) 1 / 2 , e ) 1
Example Output: c

Example Input: Problem: how many prime numbers between 1 and 100 are factors of 67830 ? 
Options: a ) 4 , b ) 5 , c ) 6 , d ) 3 , e ) 2
Example Output: c

Example Input: Problem: how many odd factors does 520 have ? 
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 8
Example Output:
b