What is the primary purpose of the Human Development Index (HDI)? A To rank countries based on life expectancy, education and income B To measure the total value of a country's goods and services C To calculate the average income of citizens in developed nations D. To determine the political corruption levels in each country

The correct answer is A. The primary purpose of the Human Development Index (HDI) is to rank countries based on life expectancy, education, and income. HDI is a composite index that measures a country's overall achievement in three basic dimensions of human development: a long and healthy life, access to knowledge, and a decent standard of living.