True, there are clauses which perform as adjectives, adverbs and nouns.
Letter d.
You cannot use a semicolon to list off objects, such as letter a and b.
You also can't use one in the middle of a sentance, like letter c.
The fourth alternative is correct (D).
It is the omniscien narrator, or narrator in the third person.
There are several types of omniscient narrator, but we can say that they are so called because they know all aspects of the story and its characters. You can, for example, describe feelings and thoughts of the characters, as well as describe things that happen in two places or with two characters at the same time.
The narrator of this passage fits this description, he demonstrates knowledge of the behavior of the characters and describes the environment in detail.
Answer:
The answer is to inform what the person is doing.
And to To entertain the author with humor.