Which observation is consistent with a chemical reaction occurring? Why?(a) Solid copper deposits on a piece of aluminum foil when the foil is placed in a blue copper nitrate solution. The blue color of the solution fades.(b) Liquid ethyl alcohol turns into a solid when placed in a low-temperature freezer.(c) A white precipitate forms when solutions of barium nitrate and sodium sulfate are mixed.(d) A mixture of sugar and water bubbles when yeasts are added. After several days, the sugar is gone and ethyl alcohol is found in the water.

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