Answer:
C-A-B-D
Explanation:
Bone marrow transplant involves infusion of healthy HSCs (hematopoetic stem cells) to recipient from donor's blood to treat life-threatening conditions.
In patients, affected with leukemia, chemotherapy is done with or without radiation to kill unhealthy, cancerous cells.
To replace these damaged cells, a donor is matched that can donate his bone marrow cells to the patient.
Once the donor is found, a sample from his bone marrow is transplanted to the bloodstream of patient, from where these cells migrate to his bone marrow and make new healthy blood cells.
Thus, the correct order is C-A-B-D.
