To provide a better line of best fit for the data plot, the best option among the responses is:
Keep it parallel and move it down so that the points are equal above and below the line.
This choice suggests adjusting the line to minimize the distance between the line and all data points, improving the overall accuracy of the fit while maintaining a consistent slope.
The other responses may not appropriately address the balance between the data points or the underlying trend. Adjusting the slope to be negative or steeper/less steep without considering the actual trend can lead to a misrepresentation of the data.