Correct Option: A

Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant cells. Symptoms of cancer depend on the type and location of the cancer. Cancer grows out of normal cells in the body. Normal cells multiply when the body needs them, and die when the body doesn’t need them. Cancer appears to occur when the growth of cells in the body is out of control and cells divide too quickly. It can also occur when cells forget how to die. The most common cause of cancer-related death is lung cancer.