Final answer:
The important triad of crops made up of beans, squash, and corn (A) were central to New World domesticates and formed the basis of the milpa intercropping system in Mesoamerica. Therefore correct option is A
Step-by-step explanation:
The important triad of crops that eventually came together in the milpa intercropping system in the New World includes beans, squash, and corn (A). The domestication of these crops played a crucial role in the development of Mesoamerican agriculture. Corn, also known as maize, was domesticated in Mesoamerica from a wild grass called teosinte. This domestication process led to the creation of larger, nutritionally rich ears of corn, a staple crop in the region.
The milpa system, which combines corn, beans, and squash, provides both agricultural and dietary benefits. The corn offers support for bean vines, while squash leaves create shade that preserves moisture in the soil and deters weeds. Nutritionally, when corn is processed using an alkaline solution, it offers an ideal diet in combination with beans and squash.