One pervasive theory explains the introduction of breakfast cereals in the early 1900s as a result of the growing number of automobiles, which led to a decline in horse ownership and a subsequent grain glut; by persuading people to eat what had previously been horse feed, market equilibrium was restored.
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Aby persuading people to eat what had previously been horse feed, market equilibrium was restored
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Bpersuading people to eat what had previously been horse feed restored market equilibrium
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Cby persuading people to eat what had previously been horse feed, it restored market equilibrium
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Dthe persuasion of people to eat what had previously been horse feed restored market equilibrium
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Emarket equilibrium was restored when people were persuaded to eat former horse feed
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正确答案: B