The author of the text that contains this quote appeals to the reader's sense of logic by quoting an authority/expert on the matter. Taking into consideration that expert's opinions, in argument, are as close to a fact as you can get without actually using a fact, this shows us how your best answer here is option B.
President Kennedy makes intensive use of parallelism and antithesis for the sake of persuasion and to make his speech more appealing to the audience. Antithesis is a rhetorical device which is used to contrast two ideas or things in a parallel sentence. Parallel structure is a literary device which consist of a repetition of some pattern of words. These stylistic devices offer the reader a more pleasant speech as well as it makes the speech easy to understand the main idea of the thought.
Example: "Let us never negotiate out of fear, but let us never fear to negotiate."
The answer is C.) All of them were from somewhere in Oklahoma
1 .verbal B .a verb form used as another part of speech
2 .restrictive clause L .an adjective clause that is essential to the meaning of the sentence
3 .prepositional phrase F .phrase beginning with a preposition
4 .infinitive E .verb form preceded by to that is used as a noun, an adjective, or an adverb
5 .adverb phrase J .prepositional phrase modifying a verb, adjective, or adverb
6 .gerund phrase M .a verbal form ending in -ing with its object and modifiers used as a noun
7 .participle A .a verb form (which may end in -ing ) used as an adjective
8 .adjective phrase G .prepositional phrase modifying a noun or pronoun
9 .phrase D .group of words without a subject and verb used as single part of speech
10 .participial phrase H .participle with complements and modifiers
11 .coordinating conjunction K .a conjunction that joins words or groups of words of equal rank
12 .verb phrase I .verb ending in -ing used with a helping verb
13 .gerund C.a verb form ending in -ing used as a noun
