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【单选题】
KMnO4滴定Na2C2O4时,第一滴KMnO4溶液褪色很慢,但以后就逐渐变快,原因是( )
A.
KMnO4电位很高，干扰多，影响反应速率
B.
当第一滴KMnO4溶液加入后，产生反应热，加快了反应速率
C.
反应产生Mn2+，它是KMnO4与Na2C2O4反应的催化剂
D.
反应产生CO2，使溶液得到充分的搅拌，加快了反应速率
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