Identify the sentence that correctly uses commas to set off ...

★ Sentence Structure and Punctuation

Identify the sentence that correctly uses commas to set off a non-essential clause.

A. My brother, who is a doctor, lives in New York.

B. My brother who is a doctor lives in New York.

C. My brother who is a doctor, lives in New York.

D. My brother, who is a doctor lives in New York.

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What is the function of the dash in this sentence? “My friend—always up for an adventure—agreed to join me.”

A. To add a list

B. To introduce a summary

C. To set off an explanatory remark

D. To indicate stuttering