Discussion
The following reaction is an example of CuCO3 → Cu + CO2
Answer: C
The reaction is a thermal decomposition.
Heating copper(II) carbonate breaks it down and drives off carbon dioxide. A single compound splitting into simpler substances under heat is the definition of thermal decomposition. The balanced equation gives copper(II) oxide as the solid product, \(\mathrm{CuCO_{3}} \rightarrow \mathrm{CuO} + \mathrm{CO_{2}}\); the paper's version writes the solid as Cu, but either way the reaction type is the same.
It is not an acid-base reaction, since no acid or base reacts. Chemiluminescence is the emission of light by a chemical reaction, which does not happen here. Photometry is a measuring technique, not a type of reaction.
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