Among the following, which is one of the main contributions of the Aztecs to agronomy?

Chinampas

The Aztecs developed an ingenious system of agriculture called chinampas, often described as "floating gardens." These fertile plots of land, built in the shallow lakes of the Valley of Mexico, allowed for efficient cultivation of vegetables, flowers, and even fruit trees. This intensive farming technique greatly contributed to the ability of Tenochtitlán to support a dense population and to the prosperity of the Aztec empire.