Which of the following reaction cannot change `SO_(2)rarrSO_(4)^(2-)`?

Which of the following reaction cannot change `SO_(2)rarrSO_(4)^(2-)`?
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Which of the following reaction cannot change `SO_(2)rarrSO_(4)^(2-)`? A. `SO_(2)+MnO_(4)^(-)overset(H^(+) ... D. `SO_(2)+Fe^(3+)overset(H^(+))(rarr)`
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