In this famous speech, Theodore Roosevelt speaks about the need to present all facts when talking about public figures. which of these best describes the rhetorical device the speaker uses to convince the audience?

The rhetorical device used by Theodore is ethos.

Explanation:

The term 'ethos' is a Greek word which means 'nature or disposition.'

According to Aristotle's appeal, ethos is one of the persuasive technique that an orator uses to sway his audience. In this form of persuasive technique, the audience is convinced by the speaker through his credibility, character, or guiding beliefs that reveals the character of the speaker.

In his famous speech at Groton School, Theodore Roosevelt addressed to the young boys who were preparing for their college. In his speech, he advised the young men to include facts when talking about public figures. He educates them that they should not pass judgement on anyone without concrete facts. This reveals about his guiding beliefs and ethical character and that he is guided by the principle of ethics and does not speak about anyone without any facts.

Thus the rhetorical device used by Theodore Roosevelt is ethos.  

the difference between an explicit and implicit meaning is that the explicit meaning of a poem is that the detail is exactly defined. nothing is left to interpretation. an implicit meaning is an implied meaning. kabir's poetry is both explicit and implicit in that it can be interpreted on different levels. the explicit meaning leaves nothing to interpretation while the implicit meaning leaves lots open to interpretation. an example of this is found in the poem "rumi and the spiritual lover".