Official Answer Key & Detailed Solution
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Correct Answer: Option (D) — National Income per head in US dollars
Concept & Option Breakdown
Standard Reference VerifiedThe Human Development Index (HDI) is a composite index measuring achievements in three basic dimensions: a long and healthy life (measured by life expectancy at birth), knowledge/education (adult literacy and gross enrolment, currently mean and expected years of schooling), and a decent standard of living (measured originally by Real GDP/National Income per capita in purchasing power terms or US dollars adjusted for PPP, currently GNI per capita in PPP $). Per the 1997 question key, it captured per capita national income.
HDI's standard of living component has always captured income per person (per capita/per head), not total aggregate GDP/GNP.
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