3. Establish a purpose for reading.
You are explaining why (the purpose) you are reading the book (for your enjoyment)
The correct answer among all the other choices is A.) He thinks of it as a period of decay. This is what the poet think of youth. Thank you for posting you question. I hope this answer helped you. Let me know if you need more help.
I think the answer is B
A is belong to economics.
C is belong to arts
D is studying the language