Do you maybe have the book or text this was from so I can try and help?
It means c) rare
scarce means rare and copious is its synonym
vacant and occupied are antonyms of scarce meaning plentiful
hence, the double colon separating the pairs of words
The statement The syntax used in these lines reflects the argument of the speaker. So the answer is option 3. The correct answer is option 3 because option 2 is not correct because it has effects on the speaker and reader.
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