Which of these conditions is a cancer that causes uncontrolled division of white blood cells, such that the number of cells greatly increases?

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Leukemia is a cancer of the white blood cells that causes their uncontrolled division and proliferation, leading to an increase in their numbers in the blood and bone marrow. Mononucleosis is a viral infection that affects white blood cells, but does not cause cancer. Iron-deficiency anemia and sickle-cell anemia are both blood disorders, but they do not involve uncontrolled growth of white blood cells.

Which of These Conditions Is a Cancer That Causes Uncontrolled