Which of the following countries has the highest Human Development Index (2021)?

The correct option is Switzerland.

The Human Development Index (HDI) is a statistical composite index used by the United Nations Development Programme (UNDP) to measure and rank countries' social and economic development levels. It is calculated based on three key dimensions:
1. Long and healthy life: Measured by life expectancy at birth.
2. Knowledge: Measured by mean years of schooling and expected years of schooling.
3. A decent standard of living: Measured by Gross National Income (GNI) per capita (purchasing power parity in US dollars).

According to the 2021/2022 Human Development Report published by the UNDP, Switzerland achieved the highest HDI score globally with a value of 0.962. Germany is also in the very high human development category with a score of 0.942, while Egypt and Nepal have lower scores reflecting medium to high categories. Therefore, Switzerland has the highest Human Development Index among the options provided.