The correct option is Access to knowledge.
Explanation
The Human Development Index (HDI), published by the United Nations Development Programme (UNDP), is a composite statistic used to rank countries based on their social and economic development. It measures average achievement in three key dimensions of human development: a long and healthy life, access to knowledge, and a decent standard of living.
Analysis of Dimensions:
- Long and healthy life: This dimension is measured by life expectancy at birth. It assesses the physical well-being and longevity of the population.
- Access to knowledge: This dimension assesses the educational attainment of the population. Historically (prior to 2010), it was measured using the adult literacy rate and the combined primary, secondary, and tertiary gross enrolment ratio. In the current methodology, these indicators have been refined to "Mean years of schooling" and "Expected years of schooling," but the dimension remains focused on knowledge and education.
- Decent standard of living: This dimension is measured by Gross National Income (GNI) per capita (adjusted for Purchasing Power Parity). It reflects the economic access to resources required for a decent life.
- Community participation: While important for human development, this is not one of the three core statistical dimensions used to calculate the HDI.
Key Takeaway:
The three dimensions of the Human Development Index are Health (Life Expectancy), Education/Knowledge (Schooling years/Literacy), and Standard of Living (GNI per capita).