The way a question is asked is a bit confusing. Depending on the scenario you will have to validate B & C. Ideally initially make sure the field is added to the field set if everything's good check for field-level security.
The question refers to the page not the profile. Field-level security hides field for profile, page just doesn't show it. So to put it back on the page you need to add it to the field set.
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snusmumrick
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