13. Which is a spectator ion in the reaction between potassium carbonate and calcium iodide? Select all that apply.
A. [tex]\mathrm{K}^{+}[/tex]
B. [tex]\mathrm{CO}_3{ }^{2-}[/tex]
C. [tex]\mathrm{Ca}^{2+}[/tex]
D. [tex]\mathrm{I}^{+}[/tex]