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

Ex Input:
Problem: what is the probability of randomly selecting an arrangement of the letters of the word ` ` mediterranean ' ' in which the first letter is e and the last letter is r ? 
Options: a ) 1 / 13 , b ) 1 / 20 , c ) 1 / 26 , d ) 1 / 50 , e ) 1 / 100

Ex Output:
c


Ex Input:
Problem: what is the probability of getting 53 mondays in a leap year ? 
Options: a ) 1 / 7 , b ) 2 / 7 , c ) 3 / 7 , d ) 4 / 7 , e ) 5 / 7

Ex Output:
b


Ex Input:
Problem: how many positive integers less than 400 can be formed using the numbers 1 , 2 , 3 and 5 for the digits ? 
Options: a ) 48 , b ) 52 , c ) 66 , d ) 84 , e ) 68

Ex Output:

e