The HDI combines life expectancy,education and standard of living to capture a broader view of development than income alone. Standard of living is represented through per capita income adjusted for purchasing power. The stem clearly points to the third dimension alongside health and education. Therefore โstandard of livingโ correctly completes the description of HDI. It is the recognised third pillar in UNDP methodology.
Option A:
Standard of living covers access to material resources and economic command over goods and services. In HDI it is captured through per capita GNI in PPP terms. Because the question asks for the third dimension along with health and education,this option fits exactly.
Option B:
Environmental quality is an important aspect of well being but it is not directly included in the basic HDI formula. Environmental indicators appear in other indices and reports,so this option does not match the specific definition in the stem.
Option C:
Political stability affects development but is not part of the HDI components. It is usually handled in governance indicators rather than the standard HDI framework,so it is not the right completion here.
Option D:
Technological progress supports human development but is again not a direct HDI component. It is reflected indirectly through income and education levels,so it does not answer the stem accurately.
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