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

Ex Input:
Problem: there are 10 students named alphabetically from a to j . what is the probability that a and d do not sit together if all 10 sit around a circular table ? 
Options: a ) 2 / 9 , b ) 2 / 5 , c ) 7 / 9 , d ) 4 / 5 , e ) 8 / 9

Ex Output:
c


Ex Input:
Problem: what is the probability of getting only 1 head in a single throw of four fair coins ? 
Options: a ) 1 / 2 , b ) 3 / 8 , c ) 1 / 4 , d ) 1 / 5 , e ) 5 / 8

Ex Output:
c


Ex Input:
Problem: there is a 20 % chance sandy will visit china this year , while there is a 60 % chance that she will visit malaysia this year . what is the probability that sandy will visit either china or malaysia this year , but not both ? 
Options: a ) 40 % , b ) 48 % , c ) 56 % , d ) 64 % , e ) 72 %

Ex Output:

c