stoichiometry - Balanced equation for neutralisation reaction betweeen potassium carbonate and hydrochloric acid

They seem all correct to me, is there any reason why one reaction would happen over the other(s)?

$$\begin{align} \ce{K2CO3 + 2 HCl &-> 2 KCl + H2CO3}\\[6pt] \ce{K2CO3 + 2 HCl &-> 2 KCl + H2O + CO2}\\[6pt] \ce{K2CO3 + HCl &-> KHCO3 + H2O} \end{align}$$