E⁰ for ${\mathrm{F}}_2 +2\stackrel{-}{\mathrm{e}} \to 2\stackrel{-}{\mathrm{F}}$  is 2.8     
E⁰ for $\frac{1}{2}{\mathrm{F}}_2 +\stackrel{-}{\mathrm{e}} \to \stackrel{-}{\mathrm{F}}$ is

• A

  2.8 V

• B

  1.4 V    

• C

  – 2.8 V   

• D

  – 1.4 V