At 298 K, the standard electrode potentials of Cu 2+/Cu , Zn 2+/Zn , Fe 2+/Fe and Ag+/Ag are 0.34 V, -0.76 V, -0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?

1. A. CuSO4(aq) + Fe(s) -> FeSO4(aq) + Cu(s)
2. B. FeSO4(aq) + Zn(s) -> ZnSO4(aq) + Fe(s)
3. C. 2CuSO4(aq) + 2Ag(s) -> 2Cu(s) + Ag2SO4(aq)
4. D. CuSO4(aq) + Zn(s) -> ZnSO4(aq) + Cu(s)

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