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Definitely the answer is choice D. Rhetoric.
The definition of rhetoric is --> <span>the art of effective or persuasive speaking or writing, especially the use of figures of speech and other compositional techniques.
I hope this helps you and have a wonderful day!! :)</span>
Answer: The journal of someone who was there at the time.
Explanation: The journal of a person who was present at the fall of the Berlin wall would be a perfect source, or footage of the event, or anything first-person. People who were actually there and participated are always the best sources for any historical event. (:
The answer is C to define or clarify a term within a text. For example ‘me and my cousin (Bob) went to the shops.’ The bracket helps me understand what the cousin is.