Gross National Income (GNI) per capita is used to measure the standard of living dimension of the Human Development Index (HDI). The HDI is a composite index of three dimensions: life expectancy, education, and standard of living. GNI per capita is a measure of the average income of a country’s citizens, and it is used to assess the standard of living in a country. A higher GNI per capita indicates a higher standard of living.
The other three options are not dimensions of the HDI. Social equity is a measure of the equality of opportunity in a society. Environmental sustainability is a measure of the ability of a society to meet its own needs without compromising the ability of future generations to meet their own needs. Governance is a measure of the effectiveness of a government in providing services to its citizens and in promoting economic development.