The answer is D. Good luck!
Yes, because (12) is referring to a page number.
I mean, if you're writing an essay, this would be correct. But if you're just stating your opinion, that's wouldn't need to be cited.
I think your answer is A: Hidden answer
hope this helps :)
D. All of these. Informational references are available in all of these.
I think it would be that its irrational and uncontrollable
