Can someone explain this quick?

[ZPederson11]

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Can someone explain how I'm wrong?

 

[DatRav27]

When producing the greatest voltage possible first you need both a reduction half reaction and oxidation half reaction that add together to form the most positive E cell. The answer you picked include two reduction reactions which would yield no voltage (no reaction occurs). The best reduction half reaction has the most positive E cell while the best oxidation half reaction has the most negative E cell. C is the correct answer

 

[ZPederson11]

Makes sense. Thanks!