Components of the Human Development Index

Steps:

• Identify HDI's three core dimensions: health, education, and standard of living.
• Health dimension uses life expectancy at birth as the indicator.
• Education dimension combines mean years of schooling and expected years of schooling.
• Confirm environmental sustainability is absent from HDI's standard formula.

Why C is correct:

• UNDP's HDI formula integrates life expectancy for health and years of schooling for education, excluding environmental factors.

Why the others are wrong:

• A omits life expectancy, which is essential for the health dimension.
• B excludes years of schooling, a key part of the education dimension.
• D includes environmental sustainability, which is not in HDI (though separate indices exist).

Final answer: C