Following is the reaction flow chart for manganese oxidocomplexes under different alkaline pH conditions. Compounds (S) and (T) respectively are

A

$$\text{S} = \text{MnO(OH)}_2$$ and $$\text{T} = \text{Mn(OH)}_2$$

B

$$\text{S} = \text{MnO}_2$$ and $$\text{T} = \text{MnO(OH)}$$

C

$$\text{S} = \text{MnO}_4^{2-}$$ and $$\text{T} = \text{MnO(OH)}$$

D

$$\text{S} = \text{MnO}_4^{2-}$$ and $$\text{T} = \text{MnO}_2$$