Final answer:
The proper in-text citation for quoting from a biography of Lincoln would be to include the author's name and publication date within parentheses after the quote.
Step-by-step explanation:
The proper way to make the required in-text citation for a sentence with a direct quote from a biography of Lincoln would be to include the author's name and publication date within parentheses after the quote. This is because when quoting the words of a source, it is important to attribute the quotation to its originator.
An example of how to introduce and attribute the quote would be: One man writes in his biography of Lincoln that "Lincoln's speech at Gettysburg is perhaps the greatest example of speech writing" (Author's Last Name, Publication Year).
The proper way to make the required in-text citation is option C) Include the author's name and publication date within parentheses after the quote.