Answer:
I think that this means that even if you're technically in the geographically best and socially highest place in the inside you may not behave properly. So even if those that are given to you are great, if you cannot represent them, they have no reason to deserve them.
(hope that's right and helpful)
#1) How does the voice affect the characterization and credibility of the text?
Answer: The way that the voice affect the characterization of the text is by giving the story a humorous tone. Also it affects the credibility of the text by overreacting and exaggerating which as a result makes the text not much credible.
I hope it helps, Regards.
"A. her fearlessness because the dog could kill her" is perhaps the best option from the list, but it should be noted that there are other elements as well.