Answer:
Literacy rate: this is a very good indicator for gauging a country's level of development because it says a lot about the educational policies of said country, and the educational attainment of its population, which in other words pertains to the human capital of the country, and human capital has been shown to be very important for economic development.
Life expectancy: this indicator is also very strong in this case for assessing healthcare in the country. A country with a good healthcare system, and good policies in this field will have a population with a high life expectancy, as it can be shown in many studies.