You can find the appropriate selection by plotting the points on the graph (actually, or mentally) and seeing which is on the line that goes 3 units up for every 1 unit to the right.
We see the point (1, 1) differs from point B in x-value by -1 and in y-value by -3, so it will be on the line with slope -3/-1 = 3 through point B.
The appropriate choice is
(1, 1)
