Answer:
(A.) ethos, an appeal based on the speaker’s credibility
Step-by-step explanation:
Ethos also known as the appeal to ethics is a way of convincing an audience on a particular topic on the basis of the credibility or authority of the speaker. In this executive order by President Franklin Delano Roosevelt, the audience would be moved to act on the orders given in this speech because of the credibility or authority of the speaker.
The audience base their trust in what the speaker says because they believe that he has sufficient knowledge on the matter and further evidence to this can be seen in the authority he holds on the subject being discussed.