Given $E^{\circ }$ (V): $\mathrm{F}{}_2/\mathrm{F}{}^{-}=2.87$, $\mathrm{Cl}{}_2/\mathrm{Cl}{}^{-}=1.36$, $\mathrm{Br}{}_2/\mathrm{Br}{}^{-}=1.09$, $\mathrm{I}{}_2/\mathrm{I}{}^{-}=0.54$. Which reaction is spontaneous under standard conditions?

1. A$\mathrm{Br}{}_2+2\mathrm{Cl}{}^{-}\to 2\mathrm{Br}{}^{-}+\mathrm{Cl}{}_2$
2. B$\mathrm{Cl}{}_2+2\mathrm{I}{}^{-}\to 2\mathrm{Cl}{}^{-}+\mathrm{I}{}_2$
3. C$\mathrm{I}{}_2+2\mathrm{Br}{}^{-}\to 2\mathrm{I}{}^{-}+\mathrm{Br}{}_2$
4. D$\mathrm{I}{}_2+2\mathrm{Cl}{}^{-}\to 2\mathrm{I}{}^{-}+\mathrm{Cl}{}_2$