d.
a compound sentence is when the sentence can be split up to make two complete sentences.
i.e. Paolo missed his girlfriend. He knew she'd be back.
d. can be split up into two fully functional sentences.
The inclusion of reputable sources and specific facts would best strengthen the author's main argument because it would offer factual proof instead of just the author's opinion on the matter.
Answer:
what is the meaning of this question
Explanation:
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