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Which of the following species/reagent c...

Which of the following species/reagent can reduce `Fe^(3+)(aq.) `into `Fe^(2+)(aq.)` at normal condiitions?
`(NH_(4))_(2)S," "Hi," "Sn^(2+)(aq.)," "CN^(-)(aq.)," "NaNO_(2)," "SO_(2)," "Na_(2)S_(2)O_(3)," "SCN^(-)(aq.)," Acidifeid "NaIO_(3)`

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