Answer:
The answer is B. very wide differences in the standard of living
Step-by-step explanation:
Economists use Gross Domestic Product (GDP) which is the final value of all goods and services produced within a country during a given period of time, usually a year as the ultimate yardstick for measuring and ranking countries' wealth, standard of living and/or illiteracy level.
And GDP per capita measures a country's economic output per person. It is by dividing the GDP of a country by its total population. Countries with the highest value are known to have a high standard of living, better health care and high literacy level and vice-versa.