Option D is correct because according to the provided context, both spinal cord injuries and Type 1 diabetes are currently at experimental or investigation stages, not yet cured. For Type 1 diabetes mellitus, the text states that 'Many medical researchers predict that soon the embryonic and adult stem cells will be able to treat...Type 1 diabetes mellitus' – indicating it is a future possibility, not a current cure. Similarly, for spinal cord injuries, the context mentions that 'The investigation using adult stem cells to regenerate new nerve cells and trigger the growth of severed nerve fibers is being carried out' – meaning research is ongoing. The text explicitly states that 'most of them are at experimental stages' with the notable exception of bone marrow transplantation. Therefore, neither condition can currently be cured with stem cells.