I am assuming that you are asking about Mr. Frank. He finds the secret room when he returns at the end of the war.
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write it like you are think about it and use a lot of details, hope this helps
<span>by providing an example of nationalism to explain the idea</span>
The answer is not A, because it is not clear enough. Who's we?
The answer is not B, the sentence is not clear about the building they are visiting.
The answer is not C, it's not clear about what building they are talking about.
So your answer is D.
C Fees are due when you register.