Question

Which factor has added to the average life expectancy?

A. Clean water supplies
B. Improved vaccinations
C. Greater availability of health care
D. All of the above

Answer 1

Education. Higher education levels are linked to higher socio-economic status and both are linked to improved longevity, according to Hall and Peterson. For those with a bachelor's degree or higher, life expectancy at age 25 increased by 1.9 years for men and 2.8 years for women, according to the CDC.

Answer 2

d. all of the above. is the answer