What role does the dialogue play in this excerpt from The Hound of the Baskervilles by Sir Arthur Conan Doyle? "Would it not be well in the first place to get rid of this Barrymore couple?"

"By no means. You could not make a greater mistake. If they are innocent it would be a cruel injustice, and if they are guilty we should be giving up all chance of bringing it home to them. No, no, we will preserve them upon our list of suspects. Then there is a groom at the Hall, if I remember right. There are two moorland farmers. There is our friend Dr. Mortimer, whom I believe to be entirely honest, and there is his wife, of whom we know nothing. There is this naturalist, Stapleton, and there is his sister, who is said to be a young lady of attractions. There is Mr. Frankland, of Lafter Hall, who is also an unknown factor, and there are one or two other neighbours. These are the folk who must be your very special study."

A.
It gives information about various characters.
B.
It advances the plot of the novel.
C.
It resolves a conflict.
D.
It develops the theme of the novel.

Part a: which of the following captures how foreign residents, or xenoi, regarded their status or position in ancient greek society? a. while some city-states discouraged immigration, most ancient greek societies allowed foreign residents partial citizenship, the most that foreigners could hope to attain. b. the majority of foreign residents felt unsafe in ancient greek society, as they were almost always expelled or killed if caught; this is because ancient greeks considered themselves superior to many if not all other civilizations. c. while their rights were limited and their relationship with locals shaky, metics had the opportunity of social mobility and full citizenship status, for either themselves or their children. d. the xenoi saw themselves as advanced and providing new services to greek society, as they often brought with them new skills, like pottery. part b: which of the following quotes best supports the answer to part a? a. “greeks persuaded themselves that it was they who had the best environment and characteristics and the purest blood line and were, therefore, born to rule.”(paragraph 11)b. “aside from slaves, most greek poleis would have had a number of free foreigners (xenoi) who had chosen to re-locate from other areas of greece, the mediterranean, and the near east, bringing with them skills such as pottery and metalworking.” (paragraph 16)c. “despite the suspicions and prejudices against foreign “barbarians” which often crop up in literary sources, there were cases when metoikoi did manage to become full citizens after a suitable display of loyalty and contribution to the good of the host state.” (paragraph 16)d. “however, some states, notably sparta, at times actively discouragedimmigration or periodically expelled xenoi.” (paragraph 16)