The Olmec most clearly influenced both the Maya and the Aztecs in the following ways:
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Construction of pyramid-shaped temples - The Olmec were known for their large earthen mounds and temple-like constructions, which influenced later Mesoamerican cultures.
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Inclusion of ball courts in ceremonial centers - The ball game and associated ball courts that the Olmec developed were adopted by both the Maya and the Aztecs as an important cultural and ceremonial activity.
The other options, "organization of independent city-states" and "worship of the patron god Huitzilopochtli," do not reflect Olmec influence specifically. The organization of city-states was more characteristic of later cultures, and Huitzilopochtli is a deity primarily associated with the Aztecs.