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Verified Answer :

I'd say B, 2 reactions. Calcite is defined as \(CaCO_{3}\), and carbonic acid as \(H_{2} C O_{3}\).

The usual reaction would be to mix both components, obtaining the following:

\(CaCO_{3}\) + \(H_{2} C O_{3}\) = \(Ca^{2+} + 2HCO_{3} ^{-}\)

Which means we have 2 reactions. Nevertheless, to give you a full explanation, I'd need more information to be sure you're not talking about a reaction with other components involved.