Which of the Following Inhibited the Mayans from Developing a Great

Which of the following inhibited the Mayans from developing a great metropolis?

A) The Mayans settled in a region that was hot, infertile, lacked navigable river systems, and that was vulnerable to hurricanes.
B) The Mayans were unable to develop long-distance trade because they lacked large domesticated pack animals.
C) The Mayans' religious beliefs were centered on worship of the natural world, so they did not need to build large cities or monumental architecture.
D) The Mayans' low population growth rates over several centuries failed to produce the manpower needed to build a large urban center.