Answer: I would contend that the right answer is actually the B) MacArthur wants to impress his listeners; Long wants to make them think.
Explanation: Just to elaborate a little on the answer, it can be added that the question is asking specifically for the purposes of their respective speeches. It is important to take into account that MacArthur's excerpt is part of an acceptance speech, whereas Long's excerpt is part of a radio address that the politician gave during the Great Depression. MacArthur is praising and commending the military for their work, using, for that purpose, a very poetic and symbolic language ("you are the leaven which binds together...," or "the shadows are lengthening for me. The twilight is here," just to give an example). His is clearly a speech aimed at impressing his listeners. Long, on the contrary, presents a series of facts and he then poses two very straightforward questions, which seem to be directed to those who were running the country at that time. He responds to the first one firmly, but he does not give an answer to the second one, since it is a rethorical question. His speech, therefore, definitely makes you think and reflect upon his words.
