Obsidian was a natural resource not found in the Olmec civilization. However, the Olmec people used obsidian to make tools. This led to the discovery that the Olmec civilization had established large A. irrigation systems. B. water routes. C. trading networks. D. subsistence farms.

The Olmec civilization had established C. Trading Networks

Explanation: Olmec artifacts have been found across Mesoamerica, indicating that there were extensive interregional trade routes.

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