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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Basically, the mood is the feeling perceived when reading a story and to describe, the setting and language used is taken into consideration because all together creates an atmosphere. Therefore, the mood of this passage is <u>mystery</u>, because of the dark setting described and the vocabulary used.
I think it would be B (Finally, they found their dog, cat, and bird) because in this case, Finally doesn't need a comma however the other three sentences need commas.
