Most likely, early Native Americans irrigated their crops. For the crops to organically grow, there was not enough rainfall. We have begun to speculate about agriculture before Columbus as farmers prepare to plant their seeds north of the equator.
Native Americans were mostly hunters and gatherers, according to conventional thinking. When they did agriculture, they had to clear new fields since their slash-and-burn methods depleted the soil.
Thus, Option C is correct.
The success of Native American agriculture is undeniably corn. The plant was domesticated in Mexico and Central America thousands of years ago and was a staple of the American diet before becoming the greatest crop in the world today (global production in 2009 was 819 million metric tons).
According to Jane Mt. Pleasant, an associate professor of horticulture at Cornell University, locals' agricultural prowess has been underappreciated despite the fact that they also developed the incredibly fruitful "three sisters" companion-cropping strategy.
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