A:2KMnO4+5H2S+3H2SO4=K2SO4+2MnSO4+5S+8H2OB:2KMnO4+8H2S+4H2SO4=K2SO4+2MnSO4+9S+12H2OC:2KMnO4+2H2S+2H2SO4=K2SO4+2MnSO4+S+4H2OD:2KMnO4+11H2S+5H2SO4=K2SO4+2MnSO4+13S+16H2O