B. There is no single topic sentence. It starts with an idea and just keeps flowing. A topic sentence will introduce the point in why the are talking about earth's plates.
Answer:
I am pretty sure that this could be a rising action
Explanation:
I have to do those all of the time :)
The answer is A. Since "meager" means something that lacks quantity/quality, this is similar to "barely thought out, with few details."