He has not been assigned, as he has been CHOSEN.
Even though there aren't any underlined words, you can still clearly see that the pronoun used is third person. This is because The narrator is talking about Mr. Phillips, and is not using pronouns like "I" and "we", which would be first person, or "you" and "you're", which would be second person.
The answer is d. Whenever subjects are joined by or or nor, the verb agrees with the nearer subject
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!