Answer:
The correct answer is D: economic health, social conditions and living conditions 
 
 
Experts who study a country's development measure the economic health, social and living conditions in order to determine the indicators that show the level of development in a country. 
 
Development indicators are those which determine the aspects affecting the well-being of the communities or individuals - they can relate to economic, health, social or living conditions, for instance: 
 
access to healthcare 
access to appropriate sanitation 
access to drinking water 
access to shelter 
crime rate 
fertility rate 
literacy rate 
infant mortality rate 
education 
the gross domestic product 
poverty level 
life expectancy 
per capita income
Step-by-step explanation: