Based on the information and graph, which statement provides the best conclusion?

Based on the information and graph, which statement provides the best conclusion?
A . Increasing the amount of salt in the solution has no effect on bean plant growth.
B . As salt concentration of the solution increases, bean plant growth decreases.
C . As salt concentration of the solution increases, bean plant growth increases.
D . The salt concentration of the solution affected only the growth of Group
F . The salt concentration had the greatest effect on the growth of Group II

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Answer: B