Acetic acid dissociates in water as:HAc (aq) + H2O(l) → H3O+ + Ac-(aq)The formula for Ka is

A、Ka=[H3O+][Ac-]/[HAc];
B、Ka=[HAc][H2O]/[H3O+][Ac-];
C、Ka=[H3O+][Ac-]/[HAc][H2O];
D、Ka=[HAc]/[H3O+][Ac-]