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Eustatic changes refer to worldwide changes in sea level caused primarily by changes in the total volume of ocean water. Ice ages (Option A) cause eustatic sea level drops as water gets locked in glaciers. Epirogenic movements (Option B) are broad vertical movements of continents, orogenic movements (Option C) are mountain-building processes, and isostatic changes (Option D) are local adjustments - none of these cause global eustatic changes.