Ahhh, the graph! Such an interesting thing. I think I can help you...
The answer is B - (3, -4).
My explanation is this.
In an ordered pair (like the one I just mentioned), the x value and the y value are represented like so: (x, y.)
If you start from the middle of the graph, where the points intersect, if you count three lines over on the horizontal line, that's your x value. 3.
But for the y, since we're counting down on the vertical line, not up, we'll have a -4 instead of a positive.
Therefore the answer (3, -4)
I hope this answers your question.
-Toremi