What Is the Conjugate Acid of the Species, HAsO₄^{2 -}

Multiple Choice

What is the conjugate acid of the species, HAsO₄^{2 -} ?

A) H₃O⁺
B) H₃AsO₄
C) H₂AsO₄^{1 -}
D) H₂AsO₄^{3 -}
E) AsO₄^{3 -}