It is a becuase it only makes the most sense out of all of them
<em>Answer: What was the main reason Commodore Perry was sent to open trade negotiations with Japan?
</em>
<em>Perry arrived in Japanese waters with a small squadron of U.S. Navy ships, because he and others believed the only way to convince the Japanese to accept western trade was to display a willingness to use its advanced firepower.</em>
Dr.King uses the elements ethos and pathos in his argument of the American dream by being perceived as credible by his audience and using the hope and determination involved with the American Dream to persuade the audience with these emotions (Hope this helps)