To classify the substances based on the given information:
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Substance A can be broken down by a physical change, which indicates it must be a mixture. Mixtures can often be separated into their components through physical means.
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Substance B cannot be broken down by either a chemical or physical change, which classifies it definitely as an element. Elements are the simplest forms of matter and cannot be broken down into simpler substances.
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Substance C can only be broken down by a chemical change, which indicates that it is a compound. Compounds consist of two or more elements chemically bonded together and can only be separated into their elemental components through chemical reactions.
Based on this reasoning, the correct classification is:
Substance A is a mixture, substance B is an element, and substance C is a compound.
This matches the second option: Substance A is a mixture, substance B is an element, and substance C is a compound.