Which sentence correctly uses a coordinating conjunction?

A coordinating conjunction joins words, phrases, or independent clauses; common examples include for, and, nor, but, or, yet, and so. In D, “so” correctly joins the two independent clauses: “The sandcastle stood far from the tide line” and “it was safe from the waves.” A and B use subordinating conjunctions, while C incorrectly places “and” after a semicolon and adds an unnecessary comma.

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