In which one of the following reactions does sulfur disproportionate?   A.  H2S(aq) + H2O  →  HS–(aq) + H3O+(aq)   B.  2NaHSO3 + H2SO4  →  Na2SO4 + 2SO2 + 2H2O   C.  H2S2  →  H2S + S   D.  SO3 + SCl2  →  SOCl2 + SO2   E.  Cu + 2H2SO4  →  CuSO4 + SO2 + 2H2O

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