Civil rights movement. He was a black poet during the battle against
racism. We just learned about him in english
"a testimonial" would most likely include positive information about one side of an issue, although it should be noted that this is not always the case with testimonials.
Billboards I think not sure because its under art and photography right?
The best way to make an effective arguments is to use one or more of three strategies: ethos, pathos, and logos. Logos uses logic and reasoning, pathos appeals to the emotions, and ethos appeals to character, like the credibility of the author. So think about each of these and then use your text to try to find which one or more the author uses.
Hopefully this helps :)