Answer:
PART B: Which of the following stanzas best supports the answer to Part A?
A. Stanza 2
I think the writer means that (especially with the second line) that there is no right or wrong way to live life - we are not guided and everything is very confusing. This is shown by the phrase "pathless wood". I also think the writer is trying to get across that they think you shouldn't think too deeply about life - just <em>live</em>. They express this in the line "It's when I'm weary of considerations". The writer is saying that life is dangerous and cruel, too, with "[O]ne line is weeping / From a twig's having lashed across it open." The writer is comparing the dangerous, ruthless, confusing woods to life itself.
The answer that looks the most right to me is Demonstrative.
The answer is because you need back up for your claim something to back up your reasoning.