At high doses, _______kills cancer cells or slows their growth by damaging their DNA. Cancer cells whose DNA is damaged beyond repair stop dividing or die. When the damaged cells die, they are broken down and removed by the body.

Radiation therapy

The correct answer is Option (2) – Radiation therapy

At high doses, radiation therapy kills cancer cells or slows their growth by damaging their DNA. This damage to the DNA is often beyond repair, causing the cancer cells to either stop dividing or die. Subsequently, when the damaged cells die, the body breaks them down and removes them. Radiation therapy is a common treatment modality used to target cancer cells localized in specific areas of the body.