The correct statement about the reaction is:
HCl is an acid, and Cl– is its conjugate base.
In this reaction, HCl donates a proton (H+) to water (H2O), making HCl a strong acid. The product Cl– is the conjugate base of HCl. Meanwhile, H2O acts as a base in this reaction, forming H3O+ (hydronium ion) after accepting the proton. Therefore, the correct identification of bases and conjugate pairs aligns with this statement.