The Human Development Index (HDI) summarizes a great deal of social performance in a single composite index, combiningA. disparity reduction rate, human resource development rate and the composite index. B. longevity, education and living standard. C. minimum schooling, adult literacy and tertiary educational attainment. D. human resource training, development and R&D.

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.