Addiction is a condition in which a person becomes habitual or dependent for a particular substance or activities in which he finds pleasure. Substances like alcohol, drugs, nicotine (tobacco) cause the person to get addicted. With every dose, the body demands for more intake. Gambling activities also engage the person in such a way that he becomes addicted and in no such circumstances he can leave these activities even if social and personal life is being affected.
So, the correct answer is 'Both A and B'.