Cancerous cells are more easily damaged by radiation than normal cells as they

The correct option is "undergo rapid division".

Radiation therapy works primarily by damaging the DNA within cells. When the DNA of a cell is severely damaged, the cell loses its ability to divide and reproduce, ultimately leading to its death.

Cells are particularly vulnerable to radiation-induced DNA damage during active phases of cell division (mitosis). Because cancerous cells undergo rapid, uncontrolled cell division compared to most normal, healthy cells in the body, they spend a significantly larger portion of their time in these vulnerable dividing states. Consequently, they are much more easily damaged and destroyed by exposure to radiation.