Answer
The least-squares regression line fits better.
Work Step by Step
In this case, it is clear that most of the points are closer to the line in part (d) compared to the line in part (b).
Some students may argue: "But in the line found in part (b), there are two points over the line and in the line found in part (d) there are none." It is important to remember that the line must be a fit for all points, so it is better to have all points closer to the line than having two points over the line with the remaining points far away from the line.
