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A higher (or more positive) E value means that the species will have a greater oxidation power. A lower (or more negative) E value means the species will have a greater reducing power. Just look at the tables and find the E values for the reduction reaction and rank them that way.
It is also important to note that you have to identify when you have to flip the Ecell standard based off the question. Even though the reaction is given one way, the problem may be asking for the reverse of the reaction (like the oxidation when only the reduction is given). In those cases, you will have to identify and flip or not flip the Ecell. Otherwise, the answer may likely be incorrect.
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