A scatter plot shows plant height (y-axis) vs. fertilizer concentration (x-axis). The data points form a curve that rises steeply at first, then flattens. What does this pattern indicate?
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A
Plant height decreases as fertilizer increases
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B
There is no relationship between fertilizer and plant height
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C
Fertilizer has diminishing returns on plant growth
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D
Plant height and fertilizer are inversely proportional