Cancer cells are more easily damaged by radiation than normal cells because they
Are undergoing rapid division
Are different in structure
The correct option is A Are undergoing rapid division
Cancer cells rapidly undergo mitosis. Cancer cells which divide rapidly are less organized than healthy cells, so, it becomes hard for them to repair the damage done by radiation. So, cancer cells are easily destroyed by radiation. On the other hand, healthy and normal cells are better able to repair themselves and survive the treatment. So, the correct answer is option A.