Which compounds are the Brønsted-Lowry bases on this equilibrium

A) H2BO3^- and H3BO3
B) HC2O4^- and H3BO3
C) HC2O4^- and C2O4^2-
D) H2BO3^- and C2O4^2-
E) HC2O4^- and H2BO3^-