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 that the sum of two dice will yield a 7 , and then when both are thrown again , their sum will again yield a 7 ? assume that each die has 6 sides with faces numbered 1 to 6 . 
Options: a ) 1 / 144 , b ) 1 / 36 , c ) 1 / 12 , d ) 1 / 6 , e ) 1 / 3

Ex Output:
b


Ex Input:
Problem: if 4 consecutive letters are selected at random from the english alphabet , then the probability that one of the letters is a vowel is ? 
Options: a ) 13 / 23 , b ) 16 / 23 , c ) 11 / 23 , d ) 17 / 23 , e ) 18 / 23

Ex Output:
d


Ex Input:
Problem: from a pack of 52 cards , 1 card is drawn at random . what is the probability that a red king is drawn ? 
Options: a ) 1 / 2 , b ) 1 / 4 , c ) 1 / 13 , d ) 1 / 26 , e ) 1 / 52

Ex Output:

d