I think it's D, the others either don't have enough punctuation or they have too much
1. Introduce the quotation with a complete sentence and a colon.
2. Use an introductory or explanatory phrase but not a complete sentence separated from the quotation with a comma.
3. Make the quotation a part of your own sentence without any punctuation between your own words and the words you are quoting.
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not clear this question ....