Which sentence uses correct punctuation? Use the "Basic Mechanics Resource" if needed.

Choice C is correctly punctuated: “Because the Mariana Trench is so deep underwater” is an introductory dependent clause, so it is followed by a comma before the main clause. In A, the apostrophe in “areas'” is unnecessary. In B, a comma—not a semicolon—should follow the introductory phrase “Located in the Pacific Ocean.” In D, “scientist's” incorrectly uses an apostrophe to make the plural noun “scientists.”

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