[tex]Fe^{2+}[/tex] is the most likely to be reduced. Hence, option A is correct.
What is oxidation?
Oxidation: The loss of electrons
Reduction: The gain of electrons
Oxidation number: the charge based on the number of electrons assigned to an atom as compared to the neutral atom.
[tex]Fe^{2+}[/tex] oxidize to [tex]Fe^{3+}[/tex] because removing the electron results in a half-filled d subshell.
Hence, option A is correct.
Learn more about the oxidation number here:
brainly.com/question/13182308
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