Answer:
D. The existence of unified patterns of behavior in warfare, science, and religion.
Step-by-step explanation:
According to a different source, this question refers to the text "Ancient Maya: The Rise and Fall of a Rainforest Civilization" by Arthur Demarest. In this text, the author argues that some of the exotic items that the Maya traded were jaguar pelts, fine textiles and feathers, which were used as symbols that unified the Maya culture. This unification was necessary for the development of complex religion, science and warfare.