AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Per capita income
Per capita income is the most common method used to measure the development of a country, as used by the World Bank to classify countries as high-income or low-income.
Source: How to Compare Different Countries or States?, Chapter 1
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The textbook (Notes for the Teacher) explicitly states: "income is the most common method for measuring development." The World Bank uses per capita income as its main criterion. Though literacy rate, IMR, and life expectancy are important indicators, they are additional criteria — not the most common one. Always remember this distinction for MCQs.