Citizens of developed nations typically experience
a. waterborne diseases
b. low literacy rates
c. unstable governments
d. long life expectancies

Citizens of developed nations typically experience d. long life expectancies.

The life expectancy is related to several characteristics such as regional differences, sex differences, and mental illness. But one of the most important features is economic circumstances. The financial situation will determine the health insurance access, minimum hygiene, as well as introduction to a better and complete diet, an important factor for avoiding diseases. A developed nation presents a higher number of wealthy citizens and has easy way to the tools that will increase their life expectancy.