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Which of the following reaction is an example of autoreduction?

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Which of the following reaction is an example of autoreduction?
A. `Fe_(3)O_(4)+4COto3Fe+4CO_(2)`
B. `Cu_(2)O+Cto2Cu+CO`
C. `Cu^(2+)(aq)+Fe(s)toCu(s)+Fe^(2+)(aq)`
D. `Cu_(2)O+(1)/(2)Cu_(2)Sto3Cu+(1)/(2)SO_(2)`
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