Final answer:
The Olmec rulers were provided food by the Olmec civilization itself through their well-developed agricultural system.
Step-by-step explanation:
The Olmec rulers were provided food by the Olmec civilization itself. The Olmec people grew crops such as maize, squash, beans, tomatoes, and cacao for chocolate. They also bred small domesticated dogs and caught fish to provide protein. The Olmec had a well-developed agricultural system that supported their rulers and the population as a whole.