Final answer:
Stevenson creates interest in the reader with mention of still undiscovered treasure and the arrival of a mysterious character in the narrator's life.
Step-by-step explanation:
The best explanation for Stevenson's reason for beginning the chapter with this paragraph is that he creates interest in the reader with mention of still undiscovered treasure and the arrival of a mysterious character in the narrator's life. By starting with these intriguing elements, Stevenson captures the reader's attention and creates anticipation for the story that follows.
Learn more about Stevenson's reason for beginning the chapter with this paragraph