This is persuasive writing written with the persuasive technique technique of Logos, which is the use of persuasion to someone's logical reasoning and using supportive facts to back it up. All the the facts presented here about the testing they do and filtering process used appeals to one's logical reasoning. That said, reading through the answers, the author's motivation is to sell the water, so the facts must speak to its credibility. Therefore, we know this is not a consumer, we know there is a motive to sell, so D is the best answer.
Yes. It's a metaphor because the writer is not implying that the boy is actually a pig; his actions represent a pig. And thus, it is a metaphorical phrase, nonetheless an actual description!
Answer: White Fang feels great fear for the power and hum of the city. In the next section, he will be haunted by a dream of a cable car attacking him--superimposed on his northern environment. White Fang realizes that this world is more powerful than he can fight against.
