Let's review what are parentheses for: <span>Parentheses, always used in pairs, are used to to provide additional information. What is inside parentheses is not the most relevant information. Inside the parentheses you can have a single word, a fragment, or multiple complete sentences.
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This being said, the right answer is:
B. Parentheses may be used to emphasize a counter argument.
I hope this helps.
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