Use the chemical reaction to answer the question.

NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?
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A. The atoms of the reactants are regrouped during the reaction.
B. Atoms of Na are destroyed during the reaction.
C. There are more H atoms after the reaction.
D.Some atoms gain mass after the reaction.