What does "totally reduced" mean?
Reduction means that electrons are added, you are talking about oxidation. I haven't heared the term "fully reduced" in this context before, but I guess it means a full shell. In case of iron this would mean a oxidation state of -10, while as far as I know the highest we can get is -4.

And don't confuse oxidation states with charge of ions.

Well, now that I see the actual question I think there's nothing to really understand here. Just a wrong, made up answer.