In a scatterplot with a trend line, points above and below the trend line often indicate how well the trend line fits the data. Ideally, if the trend line is a good representation of the overall trend of the data, the number of points above the trend line should be approximately equal to the number of points below it.
Since you have 4 points above the trend line, it would be reasonable to expect that there would also be around 4 points below the trend line for a balanced distribution of points.
Therefore, the best answer among your options would be 4 points below the trend line.