Tell me which option is correct with reason that why other one is not correct

Dear Student,
q.20 The correct option is c both national income and per capita income.
Explaination-Calculation of the index combines four major indicators: life expectancy for health, expected years of schooling, mean of years of schooling for education and Gross National Income per capita for standard of living. Every year UNDP ranks countries based on the HDI report released in their annual report.
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