Final answer:
Correct usage of the word 'camphor' is in Option B, where a Boy Scout uses it to soothe burns. The correct way to read a passage is contingent on its tone and content, which means narration style cannot be predetermined universally for all excerpts.
Step-by-step explanation:
The question posed asks which sentence correctly uses the word camphor. Camphor is a waxy, flammable, white or transparent solid substance with a strong aromatic odor, often used in medicine as a topical medication to relieve skin irritation and to reduce itchiness. It also has a variety of uses in different spiritual rituals and as an insect repellent.
Considering this, the correct answer is Option B: The Boy Scout used camphor to soothe the burns he got from the campfire. This uses the term correctly as camphor can be used for treating minor burns and reducing pain and inflammation.
As for the narration style for reading a given passage, this will depend on the content and tone of the passage itself. Each of the provided excerpts could have a different appropriate narration style, ranging from slow and thoughtful to fast-paced and urgent. There is no universal correct narration style for all pieces; it is context-dependent. Therefore, none of the options provided (A, B, C, D) are universally correct for all passages, making Option D an incorrect choice.