Over human history, which process has been most important in improving the features of plants long used by humans as staple foods?

Question

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Artificial selection, also known as selective breeding, has been the most important process in improving the features of plants long used by humans as staple foods. This process involves humans intentionally selecting and breeding plants with desired traits to create specific, improved varieties of these plants. This process has been used for thousands of years, and has resulted in the development of many of the crop plants we use today. Pesticides and herbicides have been important tools in modern agriculture, but they do not improve the features of plants themselves. Natural selection, sexual selection, and genetic engineering have also played roles in plant evolution and agriculture, but none have been as important as artificial selection in improving the features of staple food crops.

Over Human History, Which Process Has Been Most Important in Improving