The sentence that employs a correct structure and punctuation among the given options would be:
C). Nathan said, "I'm really sorry . . ."
- The third sentence most adequately employs punctuation marks of a comma(,), quotation marks("..."), and ellipses.
- While quoting the speaker's words in the direct speech, it becomes crucial to use a comma prior to the quotation mark.
- This rules out the possibility of other options being correct as they either miss it out or use a wrong punctuation mark. Thus, option C is the correct answer.
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