If Sandra Notes That the Average Income in the World

If Sandra notes that the average income in the world has gone up over the past few decades to show the progress humanity has made,what evidence might a sociologist give to contradict her?

A) The average income has actually declined.
B) The average income has fluctuated consistently over the years.
C) The average income has stagnated for the past three decades.
D) Despite a rise in average global income,there is still huge inequality between people in high-income nations and the rest of the world.