According to HDI 2018, which of the following is least developed country?

Cambodia

The correct answer is Option (3) - Cambodia

Cambodia is considered the least developed country among the options provided based on the Human Development Index (HDI) 2018. The HDI measures a country's overall achievement in three basic dimensions of human development: health, education, and standard of living. A lower HDI score indicates lower levels of human development. Therefore, Cambodia, with its relatively lower HDI score compared to the other countries listed, is categorized as the least developed among them.