The tone is "determined" to change, to get away from racism and injustice and to become real good people, to bring back dignity to those people who had been wrongly mistreated.
Answer: C
Explanation: The other ones are a bit more obvious but this one has a more impactful idea.
One of this country's most valued presidents, Abraham Lincoln, was born on Feb. 12. 1809. He was a self-educated man who even taught himself enough about the law to become a practicing lawyer and a political leader. He was known for his rugged humor and his strong sense of honesty ("Honest Abe"). When he became president, his most important goals were to preserve, protect and defend the Union. Later, he acted to end slavery in the Confederate States by issuing the Emancipation Proclamation on Jan. 1, 1863.
Rhetorical modes help the author convey their message to their audience. Many stories, even nonfiction ones, have some type of moral or bigger message. Rhetorical modes such as narration help explain the message through the eyes of a character, while others such as compare/contrast help illustrate different scenarios in which the message might play out.