Regarding the appropriate use of parentheses, all of the following statements are correct, except which one? a. parentheses may be used to explain a phrase or clause. b. parentheses may be used to emphasize a counter argument. c. parentheses may be used to de-emphasize some portion of a sentence. d. parentheses may be used to enclose and provide supplemental information.

Let's review what are parentheses for: 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.

This being said, the right answer is:
B. Parentheses may be used to emphasize a counter argument.

I hope this helps.

Then what do i do after i read the excerpt? i’m not really understanding the question here.