From the graph given, there are different points, A, B, C, and D. We are to find which two of those points are 4 units apart.
From what we can see in the graph, the graph is plotted using one unit to represent one square. So that makes it quite easy to determine the points that are 4 units apart.
The only points that are 4 units apart amongst the points are Points B and D.
From the graph, we can see that point B is at -6, while point D is at -2, so since the graph is plotted as 1cm to represent 1 unit, the units from -6 to -2 is 4 units.
Therefore the poits that are 4 unints apart in the graph are Point B and D.
So, the correct option is the last option ehich is B and D.