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Answer:
A. One substance breaks down into two or more substances.
Explanation:
Let's see the concept of a decomposition reaction:
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is:
[tex]AB\rightarrow A+B.[/tex]Based on this logic, the answer would be A. One substance breaks down into two or more substances.