Copper sulfate, when dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the steel wool disappears, a brownish solid forms, and the color of the solution changes from blue to green. Circle the choice that lists the best evidence that a chemical reaction occurred. A. The color change from blue to green happens in nature. B. The disappearance of the steel wool shows a new substance is being formed. C. The solid precipitate is a waste product in the reaction. D. Energy is lost in this reaction like all other reactions. Explain your thinking:

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