<span>i think the correct match would be :
B. neotropc south America
if we look at it physically, the Neotropic ecozone includes the tropical terresterial ecoregions of the Americas continent and it also cover the entire Temperate zones of south America.</span>
This is true. The best can be seen on examples such as the great depression which led to numerous other issues, while the roaring twenties when everything was calm and sound were also very politically stable for the lives of Americans.
It’s actually not any of those it’s osmotic flow of water :)
