According to the textbook, which civilization is considered to be "The mother of Mesoamerican cultures" because of their influence of art, architecture, agriculture, and trade?

The greatest ancient civilization of Mesoamerica is the Olmec civilization. It left a rich and influential heritage in architecture, the arts and agriculture to the following cultures of the region: the Mayas, the Toltecs, the Aztecs. In their historical accounts, there is special mention of the old people of the Olmecs and their culture and ways.