Final answer:
The process of separating grain from chaff using wind is known as winnowing. This is done after the grains have been harvested and threshed, and it involves tossing the grain so that the wind removing the lighter chaff while heavier grains fall back into the basket.
Step-by-step explanation:
To separate grain from chaff using wind refers to the process of winnowing. This traditional method was used after harvesting and threshing, where grains were tossed in a shallow basket. The lighter chaff would be blown away by the wind, while the heavier grains fell back into the basket.
Winnowing differs from threshing which is the act of removing the grains from their stalks, and it is also distinct from sifting which involves separating particles based on size. The depiction of the Harvester Vase from Hagia Triada suggests the use of winnowing in ancient cultures as part of the grain harvesting process. Furthermore, the agricultural tool patented by Cyrus Hall McCormick mechanized the harvesting but not the winnowing process.
Therefore, the correct answer to the question is: c) Winnowing.