When `KMnO_(4)` solution is added to oxalic acid solution , the decolourisation is slow in the beginning but becomes instantaneo

When `KMnO_(4)` solution is added to oxalic acid solution , the decolourisation is slow in the beginning but becomes instantaneous after some time because
A. `CO_(2)` is formed as the product
B. Reaction is exothermic
C. `MnO_(4)^(-)` catalyses the reaction
D. `Mn^(2+)` acts as autocatalyst

When `KMnO_(4)` solution is added to oxalic acid solution , the decolourisation is slow in the beginning but becomes instantaneous after some time bec

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