This graph shows predicted population by continent.

A line graph shows predicted population by continent, from 2010 to 2100. For the continents of North America, South America, and Europe, the population remains steady, under 1,000 for each. Asia is predicted to rise 5,100 by 2050 before slowly falling to 4,700 by 2100. Africa is predicted to steadily rise, from 1,000 in 2010 to 4,200 in 2100.

Which would be the most logical reason for Africa’s population growth?

higher birth rates
more land available to populate
fewer casualties in wars
high immigration rates