Which part of persuasive speech analysis does the following passage determine?

A chemist with a background in research
and medicine will be speaking.

A. Speaker's credentials
B. Speaker's bias
C. Setting of speech
D. Speaker's purpose

A. Speaker's credentials

Explanation:

The passage applies ethos, a persuasive speech technique that references the credibility of the speaker to make the audience confident in the information they are about to hear because an authority in the field is the speaker.

By talking about the profession of the speaker as well as his background in research, the audience is thus told that the person who is about to speak is knowledgeable in his field, therefore, they can trust that whatever e is about to say is factual and accurate.

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."

b. legendary founder of thebes