Final answer:
Hydrochloric acid is a reactant in the reaction between copper carbonate and hydrochloric acid. The products of the reaction are carbon dioxide, water, and copper chloride.
Step-by-step explanation:
The correct statement that describes the substances in the reaction between copper carbonate (CuCO₃) and hydrochloric acid (HCl) is B) Hydrochloric acid is a reactant.
In this reaction, copper carbonate is a solid compound that reacts with hydrochloric acid, which is an aqueous (liquid) compound. As a result of the reaction, carbon dioxide (CO₂) gas, water (H₂O), and copper chloride (CuCl₂) are formed as products.