Final answer:
The speaker begins his argument by establishing his credibility using ethos, emphasizing his responsibility and intention to abide by the Constitution and laws without making empty promises.
Step-by-step explanation:
B. The speaker begins with the rhetorical strategy ethos, establishing his credibility as a responsible and honest man.
The speaker's opening remarks in paragraph 2 are centered on his awareness and humility regarding the significant responsibilities of being the Chief Ruler. He emphasizes his intention to uphold the Constitution and laws, implicitly asking his audience to trust in his leadership and character without making empty promises. This approach concentrates on building his ethos, or ethical appeal, by highlighting his sense of duty and the solemnity with which he understands the role he is to play.