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

Ex Input:
Problem: from a group of 3 women and 3 girls , 4 are to be randomly selected . what is the probability that equal numbers of women and girls will be selected ? 
Options: a ) 3 / 5 , b ) 1 / 5 , c ) 2 / 5 , d ) 4 / 5 , e ) 1

Ex Output:
a


Ex Input:
Problem: three coins are tossed . find the probability of at least 1 head and 1 tail ? 
Options: a ) 1 / 2 , b ) 1 / 4 , c ) 3 / 4 , d ) 7 / 8 , e ) 1 / 8

Ex Output:
c


Ex Input:
Problem: 6 students are equally divided into 3 groups , then , the 3 groups were assigned to 3 different topics . how many different arrangements w are possible ? 
Options: a ) 30 , b ) 60 , c ) 90 , d ) 180 , e ) 540

Ex Output:

c