Which of the following reaction is an ex...

Which of the following reaction is an example of autoreduction?

`Fe _ 3 O _ 4 + 4 CO to 3 Fe + 4 CO _ 2 `

` Cu_2O + C to 2 Cu + CO `

` Cu^( 2 +)(aq) + Fe (s) to Cu (s) + Fe ^( 2 + ) (aq) `

` Cu _ 2 O + (1)/(2) Cu_ 2 S to 3 Cu + (1)/(2) SO _ 2 `

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