The table sets out the annual income thresholds per person that the World Bank used to group countries by their nominal Gross National Income (GNI) in 2000 and 2010. What might account for the changes shown in the table?
- AIncome inequality between countries increased between 2000 and 2010.
- BOn average, real GNI in low income countries increased by roughly one third between 2000 and 2010.
- COn average, world prices increased by roughly one third between 2000 and 2010.
- DSome of the countries in the upper middle income category in 2000 were re-classified as high income countries in 2010.