Answer: The correct answer is sodium and carbonate ions.
Step-by-step explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.
The given ionic equation is:

As, sodium and carbonate ions are present on both the sides of the reaction. Thus, it will not be present in the net ionic equation and are spectator ions.
The net ionic equation follows:

Hence, the correct answer is sodium and carbonate ions.