Answer:
The answer is A, a disease that occurs when abnormal cells multiply out of control
Step-by-step explanation:
In simple terms, cancer is defined as the uncontrolled growth of abnormal cells. Cancer can develop anywhere in the body. In leukemia, this rapid, out-of-control growth of abnormal cells takes place in the bone marrow of bones. These abnormal cells then spill into the bloodstream.
I hope this helps you out!