Which sentence is punctuated correctly?

In D, “that I would like to read” identifies which play is meant, so it is essential information and should not be set off with commas. A incorrectly uses a dash where a comma is needed to separate the nonessential clause “which has been vacant.” B needs a comma after “copper” to close the nonessential clause. C incorrectly sets off the essential clause “that I would like to visit” with dashes.

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