The reaction $2H_{2}S+S{O}_2\to 3S+2H_{2}O$ is

A. not a redox reaction because there is no oxidant in the reaction
B. not a redox reaction because there is no reductant in the reaction
C. a redox reaction in which H${}_2$S is the oxidant and SO${}_2$ is the reductant
D. a redox reaction in which SO${}_2$ is the oxidant and H${}_2$S is the reductant  

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Correct Answer: D