The best and most correct answer among the choices provided by your question is the fourth option or letter D. Lincoln-Douglass debate.
Lincoln–Douglas debate<span> is a type of one-on-one debate practiced mainly in the United States at the high school level.</span>
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An phrase ends in -ing and functions as a noun is verbals
Answer: D. That Icarus was triumphant in his flight even though he drowned.
Explanation: