Which of the Following Reactions Is a Disproportionation

Multiple Choice

Which of the following reactions is a disproportionation?

A) CaSiO₃(s) + 8HCl(aq) → H₂SiCl₆(aq) + CaCl₂(aq) + 3H₂O(l)
B) Cl₂(aq) + 2I^-(aq) → I₂(aq) + 2Cl^-(aq)
C) HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)
D) AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
E) Cl₂(g) + 2NaOH(aq) → NaClO(aq) + NaCl(aq) + H₂O(l)