Hey!
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![\Large\boxed{\mathsf{D.~Population~Density}}](https://img.qammunity.org/2020/formulas/history/middle-school/bas06xfl63wwt3fplwjw5z5zvv2lgd1qnl.png)
The map that is given gives you a hint to what the answer is. On the legend it states the hint, "people per kmĀ²". 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!