Option C is the correct answer.
In option (A) zinc displace hydrogen, therefore, the reaction is a displacement reaction.
Decomposition reaction:-When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is denoted by the equation:
[tex]AB \rightarrow A+B[/tex]
In option (c), NaCl breaks down into two products. So, the reaction is a decomposition reaction.
Hence, the reaction given in option (c) is an example of a decomposition reaction.
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