Answer:
All of the above.
Step-by-step explanation:
The stem research are important as the culture of stem cells can be used to treat the different disease. The new tissue or organ can be prepared in the laboratory by the stem cell.
The stem cell research can also produced the genetically modified stem cell that contains the mixing of stem cell of different organism. Cancer cells can be treated by stem cell research as the healthy genes can be replaced in place of cancer cells. The undifferentiated mass of stem cells can also be used to treat the disease.
Thus, the correct answer is option (D).