In humans, old, worn out erythrocytes are destroyed in the _____ and their replacements are derived from _____ residing in the _____.
A) spleen; pluripotent stem cells; red marrow B) spleen; embryonic stem cells; red marrow C) red marrow; pluripotent stem cells; spleen D) red marrow; embryonic stem cells; spleen E) liver; pluripotent stem cells; red marrow