If a country had 4 million people in 2000 and 3.5 million people in 2010, which
of the following factors must have contributed to the population change?
o
a. a decrease in the crude death rate
b. an increase in the crude birthrate
o
c. an increase in the average lifespan
d. an increase in the infant mortality rate

Option C, An increase in average lifespan

Explanation:

The decrease in the population of humans is attributed to events like long-term population trends such as reproduction under replacement, urban decay, crime, disease or other disasters in a population of humans.  

A decrease is caused by migration in human populations.

The average lifespan in the USA has dropped for the second time in 3 years, as shown by three recent CDC studies. drug overdose deaths and self killing caused much of the downturn, with even more than 70,000 reported deaths in 2017.

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