Answer: d) A and B only
Step-by-step explanation: Sporadic cancer is the form of cancer that is usually caused in those people who don't have a history of cancer . It can also occur while their DNA has got changed in certain way. They reason of cancer is due to exposure in harmful environment, diet factors, hormone effects and other factors also in the genes that damage them. They also can appear in the somatic cell. Therefore the correct option is only (a) and (b).