Three measures that can improve a country's social indicators (mortality, hdi, literacy).

That statement is true

Mortality refers to the amount of people who died in that country within a period of time, which is a good indicator of the nations' health.
HDI (human development index) refers to the development of Income and education within a country
Literacy refers to how many people could read in that country, which is correlated to intelligence and higher strata of education

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!

The answer is a for sure