A topic sentence is one that describes the topic
The exposition is the very beginning of the story so it should introduce the characters and the setting and maybe introduce a lesson to be learned.
It would be a comprehensive description and explanation of an idea.
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Answer: Maria says that Bruno must not apologize for his sister's actions out loud. That could mean trouble for both Bruno and Maria. Any sense that Maria or Bruno disagrees with Nazi ideology could mean trouble.
It made things worst because it made it harder for the slave to escape to freedom.