Theo has a strong family history of addiction, so he has seen firsthand the damage that it can do. He has decided that he is going to avoid alcohol and drugs; his life is going well, and it does not seem worth the risk. What is the BEST response to Theo? A. He should experiment to see how these substances impact him. B. He is more likely than many to become an addict, so it is a good plan. C. He is being a little paranoid and could try some recreational drinking. D. Most people cannot use the substances appropriately, so he is not unique.