Answer: think about how to summarize the text.
Explanation:
The central idea of a text refers to the main point that an author is making about a particular topic. It is referred to as the author's primary message.
Sometimes the central idea in a text can be stated but sometimes can as be inferred. In such case, it's important to summarize the text in order to derive the main point.
Therefore, the correct option is B
I'm not sure if these are answers? BUT I would say the setting explains what's happening and where they are, which give you a better idea on what's happening and lets you imagine, and understand the story more clearly.
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This is because Jim Crow laws are the laws of racial segregation in the United states that existed from just after the Civil War up until the mid-sixties which is same as the 'To Kill a Mockingbird' by Harper Lee.