which of the following correctly punctuates the parenthetical element? a the headline, accurate but…

Brief Explanations:

A parenthetical element is a word, phrase, or clause that adds extra information to a sentence but can be removed without changing the sentence's core meaning. It should be set off by commas (if it's a mild interruption) or dashes (for a more emphatic break). In option A, the dash is mis - placed as it separates the parenthetical from the main verb in an incorrect way. In option C, there is no proper closing punctuation for the parenthetical. Option B correctly uses commas to set off the parenthetical element "accurate but misleading" from the rest of the sentence.

Answer:

B. The headline, accurate but misleading, sparked three hours of unnecessary debate.