During which stage of the demographic transition shown above does a population begin to experience an explosive increase in growth?

Stage 2

Explanation:

Demographic transition: The term "demographic transition" is described as a model that is based on the interpretation of Warren Thompson during 1929 and is described as a model to explain "population change" over a period in time.

Stage 2 of the "demographic transition" is distinguished as a rapid decrease in a specific country's "death rate" whereas the "birth rate" remains high. Therefore, the total population associated with a specific country in "stage 2" would increase due to "births outnumber deaths" yet not due to the rising birth rate.