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. Corn is less nutritious than those other grains, however, and soon after these people established corn as their staple grain crop, they began having nutrition-related health problems. Yet the people continued to grow corn as their staple grain, although they could have returned to growing the more nutritious grains.
Which one of the following, if true, most helps to explain why the people mentioned continued to grow corn as their staple grain crop?
A. The variety of corn that the people relied on as their staple grain produced more food than did the ancestors of that variety.
Does not explain the paradox
B. Modern varieties of corn are more nutritious than were the varieties grown by people in North America several thousand years ago.
Wrong comparaison, Several thousand years ago and modern times
C. The people did not domesticate large animals for meat or milk, either of which could supply nutrients not provided by corn.
Does not explain the paradox
D. Some grain crops that could have been planted instead of corn required less fertile soil in order to flourish than corn required.
Does not explain the paradox
E. The people discovered some years after adopting corn as their staple grain that a diet that supplemented corn with certain readily available non&grain foods significantly improved their health.
This tells us that despite the less nutritiousness of the corn, people, somehow, have overcome the nutritive problem