To determine how to stop the spread of the tree of heaven, we need to focus on the translation. The key is to stop the edges that lead into the tip.
The approach involves stopping the edges that lead into the tip, which makes sense because the tip is a critical point where the bug can land.
After considering the obstructions, we can stop computing or dealing because the tip is the starting point.
The final answer is that we stop the axes before the tip, which corresponds to A) A.
boxed{A}