Determine Which of the Following Pairs of Reactants Will Result

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25 °C.

A) Sn⁴⁺(aq) + Mg(s) ; if E^o(Sn⁴⁺/Sn²⁺) = +0.15V and E^o(Mg²⁺/Mg) = -2.37V
B) Cr³⁺(aq) + Ni(s) ; if E^o(Cr³⁺/Cr) = -0.73V and E^o(Ni²⁺/Ni) = -0.23V
C) Zn(s) + Na⁺(aq) ; if E^o(Zn²⁺/Zn) = -0.76V and E^o(Na⁺/Na) = -2.71V
D) Fe(s) + Ba²⁺(aq) ; if E^o(Fe³⁺/Fe) = -0.04V and E^o(Ba²⁺/Ba) = -2.90V
E) Ni²⁺(aq) + NO(g) ; if E^o(Ni²⁺/Ni) = -0.23V and E^o(NO₃^-/NO) = +0.96V