The correct option is D Cancer
Cancer cells rapidly undergo mitosis. It usually spreads through the blood or the lymph system. It is mainly caused due to the mutagens which cause a sudden heritable change in the DNA content which leads to fatal abnormalities. It can be easily damaged by the radiation. An oncogene is a gene that has the potential to cause cancer. In tumour cells, they are often mutated or expressed at high levels.
So, the correct answer is option B.