Mesoamerican Farmers Are Often Credited for the Clever Idea of Growing

Mesoamerican farmers are often credited for the clever idea of growing maize,beans,and squash together,because the plants complement each others' nutritional needs.How would the Mesoamerican farmers likely have come up with this idea?

A) Beans, squash, and teosinte grow naturally together in the wild.
B) They adapted this farming technique from South Americans, who introduced maize to them.
C) They were taught this farming technique by missionaries in the 19th century.
D) These are the only plants that can be grown in the same field successfully, and it saves space.