Answer:
D. A mutation causing uncontrolled cell division
Explanation:
Cell division is controlled by various mechanisms. Any mutations in the genes regulating the cell division lead to uncontrolled cell division. Loss of control over the process of cell division leads to the formation of tumors.
These tumors may cause cancer if they are transformed into malignant tumors. Hence, a mutation that causes loss of control over cell division is harmful.
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Anemia is a blood disorder caused by a lack of iron and red blood cells.
Anemia impedes the production of protein hemoglobin in the body because of the absence or lack of the mineral iron in the blood. Iron is needed to produce the protein hemoglobin which in turn helps the red blood cells carry oxygen from the lungs and transport it all throughout the body.