The correct response is:
Bone marrow makes stem cells that turn into various blood cells.
Bone marrow is responsible for producing blood cells, including red blood cells, white blood cells, and platelets. In leukemia, the production of these cells can be disrupted, leading to cancerous cells overproducing and affecting normal blood cell function. A bone marrow transplant can provide healthy stem cells that can develop into normal blood cells, helping to restore proper blood function and support the immune system.