I would say the correct answer is <span>C. "Cat on a Hot Tin Roof" is one of the best known plays of Tennessee Williams. The title of the play needs to be put under quotation marks, and it needs to be capitalized in the correct way (nouns, pronouns, adjectives etc. need to be capitalized). However, the author's name doesn't need quotation marks.</span>
It changes the word to an adjective or a verb
The sentence is drawing a parallel between the two parties' reasons for going to war. Each of them is associated with a verb: one with "survive," the other with "perish." They are the two antonyms.
Antonyms are words which have opposite meanings. <em>Survive </em>means to contine living, and <em>perish </em>means to stop living.
What Lincoln meant by using this antonym-based parallelism is that the Confederacy fought to end the exisiting nation (meaning, to secede from the North and create a new nation), while the Union fought to keep the nation alive by preventing it from splitting.
