Answer :
The correct answer is B. Longevity, education and living standard.
Explanation:
The Human Development Index or HDI is used to analyze and measure the development of countries, this differs from other indexes and rates because it integrates three different factors: life-expectancy (longevity), education and standard of living (per capita income).
The first factor refers to the number of years people live on average in a country which is higher in developed countries due to better health services, access to quality water and food, among others. The second factor is measured through the literacy rate of a country and enrollment in education which is also higher in developed countries. Finally, the living standard is measured through the capita income that is the income of individuals during a year in a country that allows them to have a specific standard of living; this is also higher in developed countries due to higher salaries.