Answer:
The answer is: It establishes the credibility of the author.
Explanation:
This is an excerpt from John of the Mountains: The Unpublished Journals of John Muir. John Muir, America's pioneer conservationist and father of the national park system. This passage demonstrates his knowledge of the area as well as his familiarity with the various tree species which inhabit it.
The correct answer is indeed C. When people are doing ordinary things, such as eating or walking. the poem talks about the indifference that most people feel towards the suffering of others, that could be taken place "While someone else is eating or opening a window or just walking dully along".
Bilbo's indecision about whether he should go on the adventure: his determination to give it a go. The last one. I think I'm late. :/