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The best and most correct answer among the choices provided by your question is the third choice or number 3.

Sub-Saharan Africa's population growth is increasing.

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david8644

Answer:

3.positive

Explanation:

According to new researches the population of the  subsaharan african region is incerasing and will be the region that will increase the most its population, doubling its population in the next 20 years, from 1.1 nbillion to 2.4 billion in 2050 approximately. This means that the population growth is positive.