When Comparing Acid Strengths, Which One of the Items Listed

When comparing acid strengths, which one of the items listed below is not correctly labeled?

A) H₂S < H₂O
B) H₂SeO₄ < H₂SO₄
C) SiH₄ < PH₃
D) HNO₂ < HNO₃
E) H₂PO₄ ^- > HPO₄ ^{- 2}