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

[EX Q]: Problem: what is the greatest value of x such that 4 ^ x is a factor of 21 ! ? 
Options: a ) 5 , b ) 6 , c ) 3 , d ) 2 , e ) 4
[EX A]: b

[EX Q]: Problem: a dog have birth to 12 puppies , 2 female and 10 male . what is the ratio of the female puppies to the male ? 
Options: a ) 1 / 5 , b ) 1 / 6 , c ) 1 / 10 , d ) 2 / 12 , e ) 1 / 8
[EX A]: a

[EX Q]: Problem: how many positive factors do 120 and 80 have in common ? 
Options: a ) 8 , b ) 12 , c ) 16 , d ) 18 , e ) 24
[EX A]:
a