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Several thousand years ago, people in what is now North America began to grow corn, which grows faster and produces more food per unit of land than do the grains these people had grown previously. ████ ██ ████ ██████████ ████ █████ █████ ███████ ████████ ███ ████ █████ █████ ██████ ███████████ ████ ██ █████ ██████ █████ █████ ████ █████ ██████ █████████████████ ██████ █████████ ███ ███ ██████ █████████ ██ ████ ████ ██ █████ ██████ ██████ ████████ ████ █████ ████ ████████ ██ ███████ ███ ████ ██████████ ███████
"Surprising" Phenomenon
Why did North Americans choose to continue growing corn instead of other grains despite corn being less nutritious?
Objective
The correct answer must explain why North Americans chose to stick with corn rather than returning to the grains they used to grow. It will likely offer a benefit to growing corn, or perhaps a cost to growing the other grains.
11.
Which one of the following, ██ █████ ████ █████ ██ ███████ ███ ███ ██████ █████████ █████████ ██ ████ ████ ██ █████ ██████ █████ █████
a
The variety of ████ ████ ███ ██████ ██████ ██ ██ █████ ██████ █████ ████████ ████ ████ ████ ███ ███ █████████ ██ ████ ████████
b
Modern varieties of ████ ███ ████ ██████████ ████ ████ ███ █████████ █████ ██ ██████ ██ █████ ███████ ███████ ████████ █████ ████
c
The people did ███ ███████████ █████ ███████ ███ ████ ██ █████ ██████ ██ █████ █████ ██████ █████████ ███ ████████ ██ █████
d
Some of the █████ █████ ████ █████ ████ ████ ███████ ███████ ██ ████ ████████ ████ ███████ ████ ██ █████ ██ ████████ ████ ████ █████████
e
The people discovered ████ █████ █████ ████████ ████ ██ █████ ██████ █████ ████ █ ████ ████ ████████████ ████ ████ ███████ ███████ █████████ ████████ █████ █████████████ ████████ █████ ███████