Which of the groups below is often referred to as the "mother culture" of Mesoamerican Mexico?

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The Olmecs are often referred to as the "mother culture" of Mesoamerican Mexico because they were one of the earliest and most influential civilizations in the region. They existed from approximately 1400 BCE to 400 BCE and their culture heavily influenced subsequent civilizations in the area, such as the Maya and Aztecs.

Which of the Groups Below Is Often Referred to as the "Mother