Passage: "The Dust Bowl of the 1930s was not simply a natural disaster; it was the result of poor farming practices that left topsoil vulnerable to wind erosion." What argument does the author make?
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A
Human farming decisions contributed significantly to the Dust Bowl
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B
The Dust Bowl was caused solely by drought and weather
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C
Wind erosion has always been a problem on the Great Plains
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D
The 1930s were a period of good agricultural innovation