I think the answer would be A. When under stress, it can enhance a focus towards specific thing. Let’s take school for example- if you’re stressed about not having a good grade in a certain class, you might be more motivated and out focus into that’s subject. With that logic, option A would be fitting.
Driving under intoxication. And if under age it would be a dui and under aged drinking.
Cancer because of the constant use of them and the niccotine inside as well as the numerous types of poisons inside the ciggerette and the smoke.