C. Radiation

Radiation therapy uses x-rays, particles, or radioactive seeds to kill cancer cells. Cancer cells grow and divide faster than normal cells in the body. Because radiation is most harmful to quickly growing cells, radiation therapy damages cancer cells more than normal cells. This prevents the cancer cells from growing and dividing, and leads to cell death.

The two main types of radiation therapy are:

• External beam. This is the most common form. It aims x-rays or particles at the tumor from outside the body.

• Internal beam. This form delivers radiation inside your body. It may be given by radioactive seeds placed into or near the tumor; a liquid or pill that you swallow; or through a vein (intravenous, or IV).

Explanation:

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