Refer to the Graph, Which Is from Tilman's Study on Species

Refer to the graph, which is from Tilman's study on species diversity and community function in grassland ecosystems.It shows the change in efficiency of nitrogen use correlated with number of species in a community. Based on the graph, one can conclude that as species richness increases,

A) nitrogen use decreases and nitrogen soil content increases.
B) nitrogen use increases and nitrogen soil content decreases.
C) both nitrogen use and nitrogen soil content increase.
D) both nitrogen use and nitrogen soil content decrease.
E) nitrogen use appears to decline but individual points show it is random.

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