Answer:
D
Explanation:
You can't really answer this question. The x value when the y axis is intercepted is 0. The point of interception is (0,y). a and b are both probably not the answer. You have no reason to assume that the x value is an input and the y value is some result, but it is the only way you are going to get an answer.
I would pick D, but don't be surprised if it is not correct. It all depends what other questions come before this one or what you did in the lab.