B is correct "A social commentator, who explains what a book says about people in general."
In paragraphs, a stated main idea is called the topic sentence. In an article, the stated main idea is called the thesis statement. When the author does not state the main idea directly, it is called an implied main idea.
Answer:
A City, town, Or Amuesment some type of artifact or something that attracts people to your home or living area