Concept:
The Human Development Index (HDI) is a composite index developed by the United Nations Development Programme (UNDP) to measure a country's overall level of human development. It evaluates development not only in terms of income but also by considering people's health and education.
The three dimensions of HDI are:
• Health -- Measured by Life Expectancy at Birth.
• Education -- Measured by educational attainment (mean years of schooling and expected years of schooling).
• Standard of Living -- Measured by Gross National Income (GNI) per capita (earlier measured using real PCI/PPP).
Step 1: Identify the three dimensions used in HDI.
\[
\boxed{
\begin{aligned}
\text{Health} &\rightarrow \text{Life Expectancy},
\text{Education} &\rightarrow \text{Educational Attainment},
\text{Standard of Living} &\rightarrow \text{Real Per Capita Income (or GNI per capita)}.
\end{aligned}
}
\]
Step 2: Examine the given options.
• Option (A) is incorrect because HDI is not based only on income.
• Option (B) correctly includes life expectancy, education and standard of living.
• Option (C) is incorrect because the Gini coefficient is a measure of income inequality and is not a component of HDI.
• Option (D) is incorrect because the Human Poverty Index is a separate index and is not used in calculating HDI.
Hence,
\[
\boxed{\text{(B) Life expectancy, educational attainment and standard of living measured by real PCI}}
\]