Option (C) is correct. Rudolf Virchow (1855) explained that cells divide and new cells are formed from pre-existing cells (Omnis cellula-e cellula). This was a modification to the cell theory proposed by Schleiden and Schwann. The cell theory as understood today states that all cells arise from pre-existing cells. Options (A), (B), and (D) are incorrect as they contradict the fundamental principle of cell theory that new cells generate only from pre-existing cells, not from bacterial fermentation, regeneration of old cells, or abiotic materials.