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Consider the cornfield with soil that had an amino sugar N content of 350 mg/kg in Study 2. Based on Figure 2 and other information provided, was the soil in the cornfield responsive or nonresponsive?
A. Responsive, because the yield did not increase.
B. Responsive, because the yield increased.
C. Nonresponsive, because the yield did not increase.
D. Nonresponsive, because the yield increased.