银量法的滴定反应为()

A．Ag⁺ + XAg^- (或SCNAg^{-/sup>) = AgX (或AgSCN)↓}

B．Ag⁺ + Br^- = AgBr↓

C．Ag⁺ + Cl^- = AgCl↓

D．Ag⁺ + I^- = AgI↓

E．Ag⁺ + 维生素C = Ag↓