The sentence punctuated correctly is D. The author revealed that her main goal was to “Paint a vivid picture of the life of an immigrant in New York City.”
These are marks used in writing to separate sentences and their elements to clarify meanings such as a comm, fullstop etc.
In the sentence above, the fullstop comes before the closing quotation, which states clearly that the writer quoted the exact words of the author.
Second, a comma should be used after an introductory phrae or clause, and in this situation, there is no introductory phrase.
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