I think the answer is option A. taking a prescription painkiller to cause a "high". Or another possible option could be option C. Smoking marijuana when depressed to feel better. But I believe A. is correct.
Hope I could help! ;)
The correct answer is informal
The answer is A. this is because he is giving his opinion that may be different from others' and it is rude to say that someone's idea is stupid.
Answer:
Be specific is a use of this strategy.