Ionic equations.
na2co3+agno3 --> nano3 + ag2co3
b: separate aqueous solutions, remove spectator ions.
c: net ionic equation.

Answer :

When we are writing the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : It is defined as the ions present on reactant and product side which do not participate in a chemical reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

The ionic equation in separated aqueous solution will be,

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

the correct answer would be d. hope this !