In This Reaction,the Symbol (Aq)after BaCl₂ Means That It Is $\rightarrow$

In this reaction,the symbol (aq) after BaCl₂ means that it is: BaCl₂ (aq) + Na₂CO₃ (aq) $\rightarrow$ BaCO₃ (s) + 2 NaCl (aq)

A) the excess reagent.
B) an ionic compound.
C) a reactant.
D) dissolved in water.