Which observation is consistent with a
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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