To measure gender differences in terms of wealth, health, and education, the most appropriate option among those listed is the Gender Development Index (GDI). The GDI specifically focuses on gender gaps in these areas, taking into account differences in education, health (typically measured by life expectancy), and economic participation.
The other options, while useful economic indicators, do not specifically measure gender differences:
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Gross Domestic Product (GDP) provides an overall measure of economic output but does not account for gender disparities.
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Consumer Price Index (CPI) measures changes in the price level of consumer goods and services but does not relate to gender differences.
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GINI coefficient measures income inequality within a population, but again, it does not specify gender-related disparities.
Therefore, the correct answer is Gender Development Index (GDI).