Answer: The example of dialogue that is punctuated correctly is the first one: “Be careful, because the floor is wet,” he warned.
Explanation: Punctuation rules state that, when there is a direct quotation at the beginning of a sentence, a comma must always be added before the final quotation mark, unless the direct quote ends in a question or exclamation mark. In that way<u>, the example that is punctuated correctly is the first one (“Be careful, because the floor is wet,” he warned.) since it includes a comma after the word "wet" and before the final quotation mark</u>.
