Hey!
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[tex]\Large\boxed{\mathsf{D.~Population~Density}}[/tex]
The map that is given gives you a hint to what the answer is. On the legend it states the hint, "people per km²". This tells us that the map shows the population density in South America. A population density map shows which areas have the most people to least people.
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Hope This Helped! Good Luck!
