Look at the map showing the population density of Brazil. Then answer the question that follows. Why is the population density of central and western Brazil much lower than other regions of the country?

A. Because the land in those regions is covered by a dense tropical rain forest.
B. Because most of the country's oil reserves are located along its eastern coast.
C. Because temperatures in those areas tend to be much lower than in other areas.
D. Because those regions are mainly used for large commercial farming operations.

Please Answer A, B, C, Or D.