D. because it is a different subject
Summary of plot: The Price of Child is a fictionalized account of a young woman,traveling with her slave owner and two of her three children,who takes the bold step of declaring her freedom and beginning a new life as a free woman.Philadelphia in 1855 is the main setting for this story.
C. The main idea is the primary point of a piece of writing :)
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.
