Which of the following represents a disproportionation reaction ?

Options

A. `Cl_2 + 2 OH^(-) rarr ClO^(-) + Cl^(-) + H_2O`
B. `Cu_2O + H^+ rarr Cu + Cu^(2+) + OH^(-)`
C. `2HCuCl_2 overset (dilution) underset(with H_2O) rarrCu+ Cu^(2+) + 4Cl^(-) + 2H^+`
D. All of the three above.