Which best explains how the point of view affects the tone of this passage?
a. it lends some insight that makes the narrator sympathetic and credible.
b. it establishes some important background information about the narrator.
c. it conveys the narrator's lack of objectivity and impatience with bores.
d. it introduces the narrator as a detail-oriented commentator on the action.

Are you referring to this question?
Read the following excerpt from The Great Gatsby:

He didn't say any more, but we've always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that. In consequence, I'm inclined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores.
Which best explains how the point of view affects the tone of this passage?
A.It conveys the narrator's lack of objectivity and impatience with bores.
B.It establishes some important background information about the narrator.
C.It lends some insight that makes the narrator sympathetic and credible.
D.It introduces the narrator as a detail-oriented commentator on the action.

If so, then the answer would be letter C.It lends some insight that makes the narrator sympathetic and credible. 

The correct answer is the final sentence: 'Since we helped make the mess, we should organize a clean-up day'. In order to determine the purpose of a piece of writing, ask yourself why the author wrote it.

Why did the author write this paragraph? 
The author wrote this paragraph to persuade the high school to organize a clean-up day.

Now that we know the purpose of the paragraph, we can decide which of the sentences best reflects that purpose. Sentences 1, 2, and 3 provide information and describe the woods behind the school, but don't really talk about the author's purpose. The final sentence, however, is the call to action. This sentence is meant to persuade the high school to organize a clean-up day, therefore it identifies the author's purpose.

Hope this helps!