Which of the Following Statements About the Reaction Below Is $\ell$

Which of the following statements about the reaction below is correct?
HCO₃^-(aq) + H₂O( $\ell$ ) $\rightleftharpoons$ CO₃^2-(aq) + H₃O⁺(aq)

A) H₃O⁺ is an acid and HCO₃^- is its conjugate base.
B) HCO₃^- is an acid and CO₃^2- is its conjugate base.
C) HCO₃^- is an acid and H₂O is its conjugate base.
D) H₂O is an acid and CO₃^2- is its conjugate base.
E) H₃O⁺ is an acid and CO₃^2- is its conjugate base.