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Which of the following can convert acidified Cr2O7 ^2– to green ? (A) SO2 / H2SO3 / H2SO4

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Which of the following can convert acidified Cr2O7 2– to green ? 

(A) SO2 / H2SO3 / H2SO4 

(B) SO3 / H2SO3 / H2S 

(C) SO32– / H2S / Fe2+ 

(D) S2O32– / SO3 / Fe3+ 

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(C) SO32– / H2S / Fe2+ 

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