Trends with scatter plots

Adding trend lines to a scatter plot can make it easier to articulate the relationship between the two variables.

Here you can see the life expectancy for each country again, this time plotted against the Gross National Income (GNI) per capita (a measure of how rich the country is). You have a choice between linear and logarithmic scales on the x-axis, and can add linear or curved trend lines.

Which statement best describes the trend?