What graph represents a function?

Bottom answer

Step-by-step explanation:

Although I cannot see the answer labels, the answer is the very bottom graph.  The way you can find a functional graph is if you add vertical lines going down and that there is only one point that crosses it, not two.  It is kind of difficult for me to explain, so if you need help, I suggest you look up how to know when a graph is a function or not.

1/12

Explanation:
1/4 : 3 = (You have to divide by three, because you cut your part into 3 equal slices)
1/4 : 3/1 = 
1/4 x 1/3 = (When dividing by a fraction, you have to multiply by its opposite)
1/12 (Hence, the answer is 1/12)