Choose the option that contains a double dash:
-
The students, who are wearing sports shoes, will participate in the match.
-
The students -- who are wearing sports shoes -- will participate in the match.
-
The students (who are wearing sports shoes) will participate in the match.
-
The students-who are wearing sports shoes, will participate in the match.
The double dash contains two em dashes, which are longer in length than the hyphen. Depending on the context, they can replace parentheses, comma and colon. It's more informal, compared to the parentheses. It adds emphasis to the group of words that it encloses, hence separating it from the sentence. From the options, the double dash - - is seen in option B, hence it's correct. Option A contains two commas, ", ," it does not contain a double dash, hence option A is incorrect. Option C contains parentheses ( ), not the double dash. Option D contains a single dash and a comma, which is grammatically incorrect because there should either be a double dash or two commas enclosing the phrase, hence options C and D are incorrect.