Which, If Any, of the Following Metals Would Not Be

Multiple Choice

Which, if any, of the following metals would not be capable of acting as a sacrificial anode when used with iron E°_Fe = −0.44 V; all E° values refer to the M²⁺/M half-cell reactions.

A) Manganese, Mn, E° = −1.18 V
B) Cadmium, Cd, E° = −0.40 V
C) Magnesium, Mg, E° = −2.37 V
D) Zinc, Zn, E° = −0.76 V
E) All of these metals are capable of acting as sacrificial anodes with iron.