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Why does the oxalate-KMnO4 reaction speed up over time?

AThe flask warms up further
BMn2+ formed acts as a catalyst
COxalate becomes more concentrated
DKMnO4 breaks down in light
Answer & Solution
Correct answer: B. Mn2+ formed acts as a catalyst
Manganous ions produced in the reaction catalyse further reduction of permanganate, an example of autocatalysis.
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