The Human Development Index (HDI) is a composite statistic that quantifies a nation's average accomplishments across three fundamental dimensions: health, education, and standard of living.
Step 1: HDI incorporates indicators like life expectancy at birth, expected years of schooling, and Gross National Income (GNI) per capita.
Step 2: Mortality rate is not directly incorporated into HDI calculations, despite its relevance to health outcomes. The HDI prioritizes positive indicators such as life expectancy over mortality rates.
Therefore, the correct answer is (D) Mortality Rate, as it does not constitute a primary indicator of HDI.