<span>The correct answer is C. Quotation marks are always used in pairs. A is incorrect, because titles can also be italicized rather than marked with quotations, depending on the piece. B is incorrect, because they are indeed used for citing someone's exact words. D is incorrect, because italics are more often used to emphasize a word. </span>
I would have to go with D.Old age slows even the most productive and hard-working people.
Chris worked very hard the entire day however, he did not meet the deadline.
