Which of the Following Statements Most Accurately Describes the Geography

Which of the following statements most accurately describes the geography of Mesoamerica?

A) Most of the region is desert with a small tropical zone in the south.
B) From the tropical lowlands of the north the land falls again to an arid zone in the south.
C) Mesoamerica is a complex patchwork of zones that are divided vertically into cooler highlands, tropical lowlands and coasts, and an intermediate temperate zone.
D) Most of the region is a flat featureless plain covered by a virtually impenetrable sod.