B, the question was in regards to increasing RBC count in a general individual(which I took as a healthy individual). If a person is suffering from hemachromotosis, defects in IRP(iron response proteins) translation, and/or their binding elememts, or any other genetic defect that would cause an elevated RBC count then yes individuals should be wary of consuming excessive amounts of hemaglobin synthesizing compounds as well as those involved in the cell cycle mitosis cascade.
In a completely healthy individual, however, there would be no need for concern. No toxic or adverse effects have been associated with large intakes of vitamin B12/folic acid from food or supplements in healthy people.... iron on the other hand is a different story.:thumbsup: