A Buffer Solution Contains a Mixture of Carbonic Acid (H₂CO₃)and $\rightarrow$

A buffer solution contains a mixture of carbonic acid (H₂CO₃) and potassium hydrogen carbonate (KHCO₃) .What reaction will take place if H⁺ is added to this solution?

A) H₂CO₃ (aq) + H⁺ (aq) $\rightarrow$ H₃CO₃⁺ (aq)
B) HCO₃^- (aq) + H⁺ (aq) $\rightarrow$ H₂CO₃ (aq)
C) KHCO₃ (aq) + H⁺ (aq) $\rightarrow$ KH₂CO₃ (aq)
D) CO₃^2- (aq) + H⁺ (aq) $\rightarrow$ HC₂H₃O₂ (aq)