Question

Select the correctly punctuated sentence in this group.

Answer 1

The correct answer is:  [B]:
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   "Three major cities -- Hartford, Bridgeport, and Stamford -- make up the crucial voting blocks of Connecticut."
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Answer 2

Answer:

The correctly punctuated sentence is b. Three major cities -- Hartford, Bridgeport, and Stamford -- make up the crucial voting blocks of Connecticut.

Explanation:

An em dash, also called long dash, is used to mark off information or ideas that are not essential to undersand the rest of the sentence. They are used in pairs, surrounding the secondary information, in this case, Hartford, Bridgeport, and Stamford.