Your answer is A. Blank Verse
I hope that helps you!
The topic—"Literary devices in American poetry"—would be a weak topic because such a topic is extremely vague and not specific enough.
American poetry uses many, MANY literary devices—and many of which are not unique to American poetry alone. Also, "American poetry" in general is too broad of topic.
The internet is the next step.
B. is the answer, I think.
