Which of the Following Changes Is NOT Correctly Labeled as a Chemical

Which of the following changes is NOT correctly labeled as a chemical reaction or a change of state?

A) rust forming on metal, a chemical reaction
B) steam coming off of a cup of coffee, a change of state
C) an ice cube melting in a drink, a change of state
D) the combustion of gasoline to give carbon dioxide and water, a chemical reaction
E) bubbles forming in a just-opened can of soda, a chemical reaction

Correct Answer:

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