It depends on the title of the book
The answer is C it's "Comma and a subordinating conjunction."
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Have you ever read Moby Dck, a book about a white whale?
There are several primary sources that you might use, here are a few examples:
A diary written by a soldier during a battle.
Medical records of war doctors from the battle.
newspaper clippings about the battle (and published at the time of the battle).
Speeches of famous generals from the battle.
